Methods of stapling tissue

ABSTRACT

A method of stapling tissue is disclosed. The method can include obtaining a staple cartridge including a plurality of staples, wherein each staple has a base and a leg extending from the base. The stapling method can also include firing the staples from the staple cartridge, wherein the staples are fired into tissue in a staple line. The staple line can include a first portion having a first flexibility and a second portion having a second flexibility, wherein the second flexibility is different than the first flexibility. A method of stapling tissue can also include adapting an anvil with an anvil plate having an arrangement of staple-forming pockets that differs from the staple-forming pockets in the anvil.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation application that claims priority under 35 U.S.C. § 120 to U.S. patent application Ser. No. 15/385,953, filed Dec. 21, 2016, which issued on Jun. 9, 2020 as U.S. Pat. No. 10,675,026, the entire disclosure of which is hereby incorporated by reference herein.

BACKGROUND

The present invention relates to surgical instruments and, in various arrangements, to surgical stapling and cutting instruments and staple cartridges for use therewith that are designed to staple and cut tissue.

BRIEF DESCRIPTION OF THE DRAWINGS

Various features of the embodiments described herein, together with advantages thereof, may be understood in accordance with the following description taken in conjunction with the accompanying drawings as follows:

FIG. 1 is a perspective view of an interchangeable surgical tool assembly embodiment operably coupled to a handle assembly embodiment;

FIG. 2 is an exploded assembly view of portions of the handle assembly and interchangeable surgical tool assembly of FIG. 1 ;

FIG. 3 is a perspective view of a distal portion of the interchangeable surgical tool assembly embodiment depicted in FIGS. 1 and 2 with portions thereof omitted for clarity;

FIG. 4 is an exploded assembly view of a distal portion of the interchangeable surgical tool assembly of FIG. 1 ;

FIG. 5 is a partial cross-sectional perspective view of a proximal portion of the interchangeable surgical tool assembly of FIG. 1 ;

FIG. 6 is an exploded assembly view of the proximal portion of the interchangeable surgical tool assembly of FIG. 5 ;

FIG. 7 is a partial exploded assembly view of a portion of a spine assembly embodiment of the interchangeable surgical tool assembly of FIG. 1 ;

FIG. 8 is a partial cross-sectional end view of the proximal portion of the interchangeable surgical tool assembly of FIG. 5 with a clutch assembly thereof shown in an articulation mode;

FIG. 9 is another partial cross-sectional end view of the proximal portion of the interchangeable surgical tool assembly of FIG. 5 with the clutch assembly thereof shown in a firing mode;

FIG. 10 is a partial side view of the proximal portion of the interchangeable surgical tool assembly of FIG. 1 with a clutch assembly thereof shown in the articulation mode;

FIG. 11 is a partial side view of a portion of the interchangeable surgical tool assembly of FIG. 1 with the clutch assembly thereof shown in the firing mode;

FIG. 12A is a partial side cross-sectional view of the interchangeable surgical tool assembly of FIG. 1 with a closure stroke reduction assembly embodiment in a retracted orientation corresponding to the articulation mode;

FIG. 12B is a partial side cross-sectional view of the interchangeable surgical tool assembly of FIG. 12A with the closure stroke reduction assembly embodiment in an extended orientation corresponding to the firing mode;

FIG. 13 is a perspective view of a portion of the interchangeable surgical tool assembly of FIG. 12A showing the closure stroke reduction assembly embodiment in the retracted orientation corresponding to the articulation mode;

FIG. 14 is a perspective view of a portion of the interchangeable surgical tool assembly of FIG. 12B showing the closure stroke reduction assembly embodiment in the extended orientation corresponding to the firing mode;

FIG. 15A is a side elevational view of a portion of a surgical end effector embodiment with the jaws thereof in a fully closed orientation;

FIG. 15B is another side elevational view of the surgical end effector embodiment of FIG. 15A with the jaws thereof in a fully open orientation;

FIG. 16 is a perspective view of a distal closure member embodiment with positive jaw opening features;

FIG. 17 is a perspective view of a portion of a surgical end effector embodiment that is configured to be used in connection with the distal closure member of FIG. 16 ;

FIG. 18 is a side elevational view of portions of the surgical end effector of FIG. 17 with jaws thereof in a fully closed position and the distal closure member of FIG. 16 shown in cross-section;

FIG. 19 is a cross-sectional side view of the surgical end effector and distal closure member of FIG. 17 , taken along line 19-19 of FIG. 17 , with the jaws thereof in the fully closed position;

FIG. 20 is another cross-sectional side view of the surgical end effector and distal closure member of FIG. 18 with the jaws thereof in the fully open position;

FIG. 21 is a side view of the surgical end effector and distal closure member of FIG. 18 with the jaws thereof in the fully open position;

FIG. 22 is a perspective view of a portion of another surgical end effector embodiment with the anvil omitted for clarity that employs a positive jaw opening spring;

FIG. 23 is perspective view the positive jaw opening spring of FIG. 22 ;

FIG. 24 is a cross-sectional side view of the surgical end effector of FIG. 22 with jaws thereof in a fully open position;

FIG. 25 is another cross-sectional side view of the surgical end effector of FIG. 22 with jaws thereof in a fully closed position;

FIG. 26 is a side view of a portion of another surgical end effector embodiment and a distal closure member embodiment with the jaws of the surgical end effector in a fully open position;

FIG. 27 is another side view of the surgical end effector and distal closure member of FIG. 26 at the beginning of a jaw closure sequence;

FIG. 28 is another side view of the surgical end effector and distal closure member of FIG. 26 during the jaw closure sequence;

FIG. 29 is another side view of the surgical end effector and distal closure member of FIG. 26 with the jaws thereof in a fully closed position;

FIG. 30 is a perspective view of a firing member embodiment;

FIG. 31 is a side elevational view of the firing member of FIG. 30 ;

FIG. 32 is a front view of the firing member of FIG. 30 ;

FIG. 33 is a perspective view of the firing member of FIG. 30 in relation to a sled assembly embodiment and a firing member lock embodiment;

FIG. 33A is a top view of a staple driver embodiment;

FIG. 33B is a top perspective view of the staple driver embodiment of FIG. 33A;

FIG. 33C is a bottom perspective view of the staple driver embodiment of FIGS. 33A and 33B;

FIG. 34 is a bottom perspective view of the firing member lock of FIG. 33 ;

FIG. 35 is a cross-sectional side elevational view of a portion of a surgical end effector embodiment with jaws thereof in a fully open orientation and the firing member lock of FIG. 33 in an unlocked orientation;

FIG. 36 is another cross-sectional side elevational view of the surgical end effector of FIG. 35 with an unspent surgical staple cartridge supported in one of the jaws and retaining the firing member lock in the unlocked orientation;

FIG. 37 is another cross-sectional side elevational view of the surgical end effector of FIG. 36 after a firing sequence has been commenced;

FIG. 38 is another cross-sectional side elevational view of the surgical end effector of FIG. 36 as the firing member is being retracted back to a starting position;

FIG. 39 is a top cross-sectional view of the firing member and firing member lock in the position shown in FIG. 38 ;

FIG. 40 is another cross-sectional side elevational view of the surgical end effector of FIG. 36 after the firing member has been retracted back to the starting position;

FIG. 41 a top cross-sectional view of the firing member and firing member lock in the position shown in FIG. 40 ;

FIG. 42 is a cross-sectional side elevational view of a portion of another surgical end effector embodiment with jaws thereof in a fully open orientation and another firing member lock embodiment of FIG. 33 in a locked orientation;

FIG. 43 is a left side perspective view of portions of another surgical end effector embodiment and distal closure member embodiment with jaws of the surgical end effector in a fully open position and supporting a surgical staple cartridge therein with expandable tissue stops in a fully expanded orientation;

FIG. 44 is a right side perspective view of the surgical end effector of FIG. 43 ;

FIG. 45 is an exploded perspective view of one of the jaws and the surgical staple cartridge of FIGS. 43 and 44 ;

FIG. 46 is a perspective view of a stop spring of one of the expandable tissue stops of FIG. 43 ;

FIG. 47 is a partial cross-sectional end view of the surgical end effector of FIGS. 42 and 43 with the jaws thereof in the fully open orientation and the expandable tissue stops thereof in their fully expanded orientations;

FIG. 48 is a top view of a portion of the surgical staple cartridge of FIGS. 42 and 43 ;

FIG. 49 is a cross-sectional side view of the surgical end effector of FIG. 48 , taken along line 49-49 of FIG. 48 , with the jaws thereof in the fully closed position;

FIG. 50 is another cross-sectional side view of the surgical end effector of FIG. 47 , taken along line 50-50 of FIG. 47 , with the jaws thereof in the fully open position;

FIG. 51 is a partial cross-sectional end view of another surgical end effector embodiment with the jaws thereof in a fully open orientation;

FIG. 52 is a side elevational view of a portion of the surgical end effector of FIG. 51 with the jaws thereof in a fully open orientation;

FIG. 53 is another side elevational view of a portion of the surgical end effector of FIG. 51 with the jaws thereof in a fully closed orientation;

FIG. 54 is a perspective view of a staple cartridge body having a plurality of staple cavities defined therein;

FIG. 55 is a partial perspective bottom view of the staple cartridge body of FIG. 54 ;

FIG. 56 is a top plan view of the staple cartridge body of FIG. 54 depicting a cutting element positioned in a longitudinal slot of the cartridge body;

FIG. 57 is a bottom plan view of the staple cartridge body of FIG. 54 depicting drivers positioned in the staple cavities;

FIG. 58 is a staple line implanted in stapled tissue and generated by the staple cartridge body of FIG. 54 and depicting certain staples that are likely to be missing from the staple line with phantom lines;

FIG. 59 is a side elevation view of a staple in the staple line of FIG. 58 ;

FIG. 60 is a side elevation view of a staple;

FIG. 61 is a bottom plan view of a staple cartridge body having a plurality of staple cavities defined therein and depicting drivers positioned in the staple cavities;

FIG. 62 is a perspective view of the drivers in the proximal staple cavities of FIG. 57 ;

FIG. 63 is a side elevation view of the drivers of FIG. 62 depicting an offset ramped surface with a phantom line;

FIG. 64 is a plan view of the drivers of FIG. 62 ;

FIG. 65 is a front elevation view of the drivers of FIG. 62 ;

FIG. 66 is a plan view of the drivers in the proximal staple cavities of the staple cartridge body of FIG. 61 ;

FIG. 67 is a front elevation view of the drivers of FIG. 66 ;

FIG. 68 is a top plan view of a staple cartridge body having a plurality of staple cavities defined therein;

FIG. 69 is a bottom plan view of the staple cartridge body of FIG. 68 depicting drivers positioned in the staple cavities;

FIG. 70 is a perspective view of the drivers in the proximal staple cavities of FIG. 69 ;

FIG. 71 is a front elevation view of the drivers of FIG. 70 ;

FIG. 72 is a plan view of the drivers of FIG. 70 ;

FIG. 73 is a side elevation view of the drivers of FIG. 70 depicting an offset ramped surface with a phantom line;

FIG. 74 is a top plan view of a staple cartridge body having a plurality of staple cavities defined therein;

FIG. 75 is a bottom plan view of the staple cartridge body of FIG. 74 and depicting drivers positioned in the staple cavities;

FIG. 76 is a plan view of a portion of a staple cartridge body having a plurality of angularly-oriented staple cavities defined therein and depicting staples in the staple cavities;

FIG. 77 is a plan view of a portion of a staple cartridge body having a plurality of angularly-oriented staple cavities defined therein and depicting staples in the staple cavities;

FIG. 78 is a plan view of a portion of a staple cartridge body having a plurality of angularly-oriented staple cavities defined therein and depicting staples in the staple cavities;

FIG. 79 is a plan view of a portion of a staple cartridge body having a plurality of angularly-oriented staple cavities defined therein and depicting staples in the staple cavities;

FIG. 80 is a plan view of a portion of a staple cartridge body having a plurality of angularly-oriented staple cavities defined therein and depicting staples in the staple cavities;

FIG. 81 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 82 is a detail view of a pocket of FIG. 81 ;

FIGS. 83, 84A, 84B, and 84C are cross-sectional views of the pocket of FIG. 82 , taken along lines 83-83, 84A-84A, 84B-84B and 84C-84C respectively;

FIG. 85 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 86 is a detail view of a pocket of FIG. 85 ;

FIGS. 87, 88A, 88B, and 88C are cross-sectional views of the pocket of FIG. 86 , taken along lines 87-87, 88A-88A, 88B-88B, and 88C-88C respectively;

FIG. 89 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 90 is a detail view of a pocket of FIG. 89 ;

FIGS. 91, 92A, 92B, and 92C are cross-sectional views of the pocket of FIG. 90 , taken along lines 91-91, 92A-92A, 92B-92B, and 92C-92C respectively;

FIG. 93 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 94 is a detail view of a pocket of FIG. 93 ;

FIGS. 95, 96A, 96B, and 96C are cross-sectional views of the pocket of FIG. 94 , taken along lines 95-95, 96A-96A, 96B-96B, and 96C-96C respectively;

FIG. 97 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 98 is a detail view of a pocket of FIG. 97 ;

FIGS. 99, 100A, 100B, and 100C are cross-sectional views of the pocket of FIG. 98 , taken along lines 99-99, 100A-100A, 100B-100B, and 100C-100C respectively;

FIG. 101 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 102 is a detail view of a pocket of FIG. 101 ;

FIGS. 103, 104A, 104B, and 104C are cross-sectional views of the pocket of FIG. 102 , taken along lines 103-103, 104A-104A, 104B-104B, and 104C-104C respectively;

FIG. 105 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 106 is a detail view of a pocket of FIG. 105 ;

FIGS. 107, 108A, 108B, and 108C are cross-sectional views of the pocket of FIG. 106 , taken along lines 107-107, 108A-108A, 108B-108B, and 108C-108C respectively;

FIG. 109 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 110 is a detail view of a pocket of FIG. 109 ;

FIGS. 111, 112A, 112B, 112C are cross-sectional views of the pocket of FIG. 110 , taken along lines 111-111, 112A-112A, 112B-112B, and 112C-112C respectively;

FIG. 113 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 114 is a detail view of a pocket of FIG. 113 ;

FIGS. 115, 116A, 116B, 116C are cross-sectional views of the pocket of FIG. 114 , taken along lines 115-115, 116A-116A, 116B-116B, 116C-116C respectively;

FIG. 117 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 118 is a detail view of a pocket of FIG. 117 ;

FIGS. 119, 120A, 120B, and 120C are cross-sectional views of the pocket of FIG. 118 , taken along lines 119-119, 120A-120A, 120B-120B, and 120C-120C respectively;

FIG. 121 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein;

FIG. 122 is a detail view of a pocket of FIG. 121 ;

FIGS. 123, 124A, 124B, 124C, 125A, 125B, and 125C are cross-sectional views of the pocket of FIG. 122 , taken along lines 123-123, 124A-124A, 124B-124B, 124C-124C, 125A-125A, 125B-125B, and 125C-125C;

FIG. 126 is an exploded perspective view of an end effector and an adaptor assembly;

FIG. 127 is a cross-sectional perspective view of a portion of the end effector and the adaptor assembly of FIG. 126 ;

FIG. 128 is a cross-sectional perspective view of a portion of the end effector of FIG. 126 and an adaptor assembly; and

FIG. 129 is a plan view of a portion of an anvil having a plurality of staple-forming pockets defined therein.

Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate various embodiments of the invention, in one form, and such exemplifications are not to be construed as limiting the scope of the invention in any manner.

DETAILED DESCRIPTION

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/386,185, entitled SURGICAL         STAPLING INSTRUMENTS AND REPLACEABLE TOOL ASSEMBLIES THEREOF,         now U.S. Pat. No. 10,639,035;     -   U.S. patent application Ser. No. 15/386,230, entitled         ARTICULATABLE SURGICAL STAPLING INSTRUMENTS, now U.S. Patent         Application Publication No. 2018/0168649, issued as U.S. Pat.         No. 11,160,551 on Nov. 2, 2021;     -   U.S. patent application Ser. No. 15/386,221, entitled LOCKOUT         ARRANGEMENTS FOR SURGICAL END EFFECTORS, now U.S. Patent         Application Publication No. 2018/0168646, issued as U.S. Pat.         No. 10,835,247 on Nov. 17, 2020;     -   U.S. patent application Ser. No. 15/386,209, entitled SURGICAL         END EFFECTORS AND FIRING MEMBERS THEREOF, now U.S. Pat. No.         10,588,632;     -   U.S. patent application Ser. No. 15/386,198, entitled LOCKOUT         ARRANGEMENTS FOR SURGICAL END EFFECTORS AND REPLACEABLE TOOL         ASSEMBLIES, now U.S. Pat. No. 10,610,224; and     -   U.S. patent application Ser. No. 15/386,240, entitled SURGICAL         END EFFECTORS AND ADAPTABLE FIRING MEMBERS THEREFOR, now U.S.         Patent Application Publication No. 2018/0168651, issued as U.S.         Pat. No. 10,973,516 on Apr. 13, 2021.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/385,939, entitled STAPLE         CARTRIDGES AND ARRANGEMENTS OF STAPLES AND STAPLE CAVITIES         THEREIN, now U.S. Patent Application Publication No.         2018/0168629, issued as U.S. Pat. No. 10,835,246 on Nov. 17,         2020;     -   U.S. patent application Ser. No. 15/385,941, entitled SURGICAL         TOOL ASSEMBLIES WITH CLUTCHING ARRANGEMENTS FOR SHIFTING BETWEEN         CLOSURE SYSTEMS WITH CLOSURE STROKE REDUCTION FEATURES AND         ARTICULATION AND FIRING SYSTEMS, now U.S. Patent Application         Publication No. 2018/0168630, issued as U.S. Pat. No. 10,736,629         on Aug. 11, 2020;     -   U.S. patent application Ser. No. 15/385,943, entitled SURGICAL         STAPLING INSTRUMENTS AND STAPLE-FORMING ANVILS, now U.S. Patent         Application Publication No. 2018/0168631, issued as U.S. Pat.         No. 10,667,811 on Jun. 2, 2020;     -   U.S. patent application Ser. No. 15/385,950, entitled SURGICAL         TOOL ASSEMBLIES WITH CLOSURE STROKE REDUCTION FEATURES, now U.S.         Pat. No. 10,588,630;     -   U.S. patent application Ser. No. 15/385,945, entitled STAPLE         CARTRIDGES AND ARRANGEMENTS OF STAPLES AND STAPLE CAVITIES         THEREIN, now U.S. Patent Application Publication No.         2018/0168632, issued as U.S. Pat. No. 10,893,864 on Jan. 19,         2021;     -   U.S. patent application Ser. No. 15/385,946, entitled SURGICAL         STAPLING INSTRUMENTS AND STAPLE-FORMING ANVILS, now U.S. Patent         Application Publication No. 2018/0168633, now abandoned;     -   U.S. patent application Ser. No. 15/385,951, entitled SURGICAL         INSTRUMENTS WITH JAW OPENING FEATURES FOR INCREASING A JAW         OPENING DISTANCE, now U.S. Pat. No. 10,568,626;     -   U.S. patent application Ser. No. 15/385,954, entitled FIRING         MEMBERS WITH NON-PARALLEL JAW ENGAGEMENT FEATURES FOR SURGICAL         END EFFECTORS, now U.S. Pat. No. 10,624,635;     -   U.S. patent application Ser. No. 15/385,955, entitled SURGICAL         END EFFECTORS WITH EXPANDABLE TISSUE STOP ARRANGEMENTS, now U.S.         Patent Application Publication No. 2018/0168639, issued as U.S.         Pat. No. 10,813,638 on Oct. 27, 2020;     -   U.S. patent application Ser. No. 15/385,948, entitled SURGICAL         STAPLING INSTRUMENTS AND STAPLE-FORMING ANVILS, now U.S. Patent         Application Publication No. 2018/0168584, issued as U.S. Pat.         No. 11,134,942 on Oct. 5, 2021;     -   U.S. patent application Ser. No. 15/385,956, entitled SURGICAL         INSTRUMENTS WITH POSITIVE JAW OPENING FEATURES, now U.S. Pat.         No. 10,588,631;     -   U.S. patent application Ser. No. 15/385,958, entitled SURGICAL         INSTRUMENTS WITH LOCKOUT ARRANGEMENTS FOR PREVENTING FIRING         SYSTEM ACTUATION UNLESS AN UNSPENT STAPLE CARTRIDGE IS PRESENT,         now U.S. Pat. No. 10,639,034; and     -   U.S. patent application Ser. No. 15/385,947, entitled STAPLE         CARTRIDGES AND ARRANGEMENTS OF STAPLES AND STAPLE CAVITIES         THEREIN, now U.S. Pat. No. 10,568,625.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/385,896, entitled METHOD FOR         RESETTING A FUSE OF A SURGICAL INSTRUMENT SHAFT, now U.S. Patent         Application Publication No. 2018/0168597, issued as U.S. Pat.         No. 11,090,048 on Aug. 17, 2021;     -   U.S. patent application Ser. No. 15/385,898, entitled STAPLE         FORMING POCKET ARRANGEMENT TO ACCOMMODATE DIFFERENT TYPES OF         STAPLES, now U.S. Pat. No. 10,537,325;     -   U.S. patent application Ser. No. 15/385,899 entitled SURGICAL         INSTRUMENT COMPRISING IMPROVED JAW CONTROL, now U.S. Patent         Application Publication No. 2018/0168600, issued as U.S. Pat.         No. 10,758,229 on Sep. 1, 2020;     -   U.S. patent application Ser. No. 15/385,901, entitled STAPLE         CARTRIDGE AND STAPLE CARTRIDGE CHANNEL COMPRISING WINDOWS         DEFINED THEREIN, now U.S. Patent Application Publication No.         2018/0168602, issued as U.S. Pat. No. 10,667,809 on Jun. 2,         2020;     -   U.S. patent application Ser. No. 15/385,902, entitled SURGICAL         INSTRUMENT COMPRISING A CUTTING MEMBER, now U.S. Patent         Application Publication No. 2018/0168603, issued as U.S. Pat.         No. 10,888,322 on Jan. 12, 2021;     -   U.S. patent application Ser. No. 15/385,904, entitled STAPLE         FIRING MEMBER COMPRISING A MISSING CARTRIDGE AND/OR SPENT         CARTRIDGE LOCKOUT, now U.S. Patent Application Publication No.         2018/0168605, issued as U.S. Pat. No. 10,881,401 on Jan. 5,         2021;     -   U.S. patent application Ser. No. 15/385,905, entitled FIRING         ASSEMBLY COMPRISING A LOCKOUT, now U.S. Patent Application         Publication No. 2018/0168606, issued as U.S. Pat. No. 10,695,055         on Jun. 30, 2020;     -   U.S. patent application Ser. No. 15/385,907, entitled SURGICAL         INSTRUMENT SYSTEM COMPRISING AN END EFFECTOR LOCKOUT AND A         FIRING ASSEMBLY LOCKOUT, now U.S. Patent Application Publication         No. 2018/0168608, now abandoned;     -   U.S. patent application Ser. No. 15/385,908, entitled FIRING         ASSEMBLY COMPRISING A FUSE, now U.S. Patent Application         Publication No. 2018/0168609, now abandoned; and     -   U.S. patent application Ser. No. 15/385,909, entitled FIRING         ASSEMBLY COMPRISING A MULTIPLE FAILED-STATE FUSE, now U.S.         Patent Application Publication No. 2018/0168610, issued as U.S.         Pat. No. 11,571,201 on Feb. 7, 2023.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/385,920, entitled STAPLE         FORMING POCKET ARRANGEMENTS, now U.S. Pat. No. 10,499,914;     -   U.S. patent application Ser. No. 15/385,913, entitled ANVIL         ARRANGEMENTS FOR SURGICAL STAPLERS, now U.S. Patent Application         Publication No. 2018/0168614, issued as U.S. Pat. No. 11,179,155         on Nov. 23, 2021;     -   U.S. patent application Ser. No. 15/385,914, entitled METHOD OF         DEFORMING STAPLES FROM TWO DIFFERENT TYPES OF STAPLE CARTRIDGES         WITH THE SAME SURGICAL STAPLING INSTRUMENT, now U.S. Patent         Application Publication No. 2018/0168615, now abandoned;     -   U.S. patent application Ser. No. 15/385,893, entitled         BILATERALLY ASYMMETRIC STAPLE FORMING POCKET PAIRS, now U.S.         Patent Application Publication No. 2018/0168594, issued as U.S.         Pat. No. 10,682,138 on Jun. 16, 2020;     -   U.S. patent application Ser. No. 15/385,929, entitled CLOSURE         MEMBERS WITH CAM SURFACE ARRANGEMENTS FOR SURGICAL INSTRUMENTS         WITH SEPARATE AND DISTINCT CLOSURE AND FIRING SYSTEMS, now U.S.         Patent Application Publication No. 2018/0168626, issued as U.S.         Pat. No. 10,667,810 on Jun. 2, 2020;     -   U.S. patent application Ser. No. 15/385,911, entitled SURGICAL         STAPLERS WITH INDEPENDENTLY ACTUATABLE CLOSING AND FIRING         SYSTEMS, now U.S. Pat. No. 10,448,950;     -   U.S. patent application Ser. No. 15/385,927, entitled SURGICAL         STAPLING INSTRUMENTS WITH SMART STAPLE CARTRIDGES, now U.S.         Patent Application Publication No 2018/0168625, now abandoned;     -   U.S. patent application Ser. No. 15/385,917, entitled STAPLE         CARTRIDGE COMPRISING STAPLES WITH DIFFERENT CLAMPING BREADTHS,         now U.S. Patent Application Publication No. 2018/0168617, issued         as U.S. Pat. No. 10,993,715 on May 4, 2021;     -   U.S. patent application Ser. No. 15/385,900, entitled STAPLE         FORMING POCKET ARRANGEMENTS COMPRISING PRIMARY SIDEWALLS AND         POCKET SIDEWALLS, now U.S. Patent Application Publication No.         2018/0168601, issued as U.S. Pat. No. 10,898,168 on Jan. 26,         2021;     -   U.S. patent application Ser. No. 15/385,931, entitled         NO-CARTRIDGE AND SPENT CARTRIDGE LOCKOUT ARRANGEMENTS FOR         SURGICAL STAPLERS, now U.S. Patent Application Publication No.         2018/0168627, issued as U.S. Pat. No. 10,980,536 on Apr. 20,         2021;     -   U.S. patent application Ser. No. 15/385,915, entitled FIRING         MEMBER PIN ANGLE, now U.S. Patent Application Publication No.         2018/0168616, issued as U.S. Pat. No. 10,779,823 on Sep. 22,         2020;     -   U.S. patent application Ser. No. 15/385,897, entitled STAPLE         FORMING POCKET ARRANGEMENTS COMPRISING ZONED FORMING SURFACE         GROOVES, now U.S. Patent Application Publication No.         2018/0168598, now abandoned;     -   U.S. patent application Ser. No. 15/385,922, entitled SURGICAL         INSTRUMENT WITH MULTIPLE FAILURE RESPONSE MODES, now U.S. Pat.         No. 10,426,471;     -   U.S. patent application Ser. No. 15/385,924, entitled SURGICAL         INSTRUMENT WITH PRIMARY AND SAFETY PROCESSORS, now U.S. Patent         Application Publication No. 2018/0168624, issued as U.S. Pat.         No. 10,758,230 Sep. 1, 2020;     -   U.S. patent application Ser. No. 15/385,912, entitled SURGICAL         INSTRUMENTS WITH JAWS THAT ARE PIVOTABLE ABOUT A FIXED AXIS AND         INCLUDE SEPARATE AND DISTINCT CLOSURE AND FIRING SYSTEMS, now         U.S. Pat. No. 10,568,624;     -   U.S. patent application Ser. No. 15/385,910, entitled ANVIL         HAVING A KNIFE SLOT WIDTH, now U.S. Pat. No. 10,485,543;     -   U.S. patent application Ser. No. 15/385,903, entitled CLOSURE         MEMBER ARRANGEMENTS FOR SURGICAL INSTRUMENTS, now U.S. Pat. No.         10,617,414; and     -   U.S. patent application Ser. No. 15/385,906, entitled FIRING         MEMBER PIN CONFIGURATIONS, now U.S. Patent Application         Publication No. 2018/0168607, issued as U.S. Pat. No. 10,856,868         on Dec. 8, 2020.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/386,188, entitled STEPPED         STAPLE CARTRIDGE WITH ASYMMETRICAL STAPLES, now U.S. Pat. No.         10,537,324;     -   U.S. patent application Ser. No. 15/386,192, entitled STEPPED         STAPLE CARTRIDGE WITH TISSUE RETENTION AND GAP SETTING FEATURES,         now U.S. Patent Application Publication No. 2018/0168643, issued         as U.S. Pat. No. 10,687,810 Jun. 23, 2020;     -   U.S. patent application Ser. No. 15/386,206, entitled STAPLE         CARTRIDGE WITH DEFORMABLE DRIVER RETENTION FEATURES, now U.S.         Patent Application Publication No. 2018/0168586, issued as U.S.         Pat. No. 10,945,727 on Mar. 16, 2021;     -   U.S. patent application Ser. No. 15/386,226, entitled DURABILITY         FEATURES FOR END EFFECTORS AND FIRING ASSEMBLIES OF SURGICAL         STAPLING INSTRUMENTS, now U.S. Patent Application Publication         No. 2018/0168648, now abandoned;     -   U.S. patent application Ser. No. 15/386,222, entitled SURGICAL         STAPLING INSTRUMENTS HAVING END EFFECTORS WITH POSITIVE OPENING         FEATURES, now U.S. Patent Application Publication No.         2018/0168647, now abandoned; and     -   U.S. patent application Ser. No. 15/386,236, entitled CONNECTION         PORTIONS FOR DISPOSABLE LOADING UNITS FOR SURGICAL STAPLING         INSTRUMENTS, now U.S. Patent Application Publication No.         2018/0168650, now abandoned.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/385,887, entitled METHOD FOR         ATTACHING A SHAFT ASSEMBLY TO A SURGICAL INSTRUMENT AND,         ALTERNATIVELY, TO A SURGICAL ROBOT, now U.S. Patent Application         Publication No. 2018/0168589, issued as U.S. Pat. No. 10,835,245         on Nov. 17, 2020;     -   U.S. patent application Ser. No. 15/385,889, entitled SHAFT         ASSEMBLY COMPRISING A MANUALLY-OPERABLE RETRACTION SYSTEM FOR         USE WITH A MOTORIZED SURGICAL INSTRUMENT SYSTEM, now U.S. Patent         Application Publication No. 2018/0168590, issued as U.S. Pat.         No. 11,191,539 on Dec. 7, 2021;     -   U.S. patent application Ser. No. 15/385,890, entitled SHAFT         ASSEMBLY COMPRISING SEPARATELY ACTUATABLE AND RETRACTABLE         SYSTEMS, now U.S. Patent Application Publication No.         2018/0168591, issued as U.S. Pat. No. 10,675,025 on Jun. 9,         2020;     -   U.S. patent application Ser. No. 15/385,891, entitled SHAFT         ASSEMBLY COMPRISING A CLUTCH CONFIGURED TO ADAPT THE OUTPUT OF A         ROTARY FIRING MEMBER TO TWO DIFFERENT SYSTEMS, now U.S. Patent         Application Publication No. 2018/0168592, issued as U.S. Pat.         No. 11,419,606 on Aug. 23, 2022;     -   U.S. patent application Ser. No. 15/385,892, entitled SURGICAL         SYSTEM COMPRISING A FIRING MEMBER ROTATABLE INTO AN ARTICULATION         STATE TO ARTICULATE AN END EFFECTOR OF THE SURGICAL SYSTEM, now         U.S. Patent Application Publication No. 2018/0168593, issued as         U.S. Pat. No. 10,918,358 on Feb. 16, 2021;     -   U.S. patent application Ser. No. 15/385,894, entitled SHAFT         ASSEMBLY COMPRISING A LOCKOUT, now U.S. Pat. No. 10,492,785; and     -   U.S. patent application Ser. No. 15/385,895, entitled SHAFT         ASSEMBLY COMPRISING FIRST AND SECOND ARTICULATION LOCKOUTS, now         U.S. Pat. No. 10,542,982.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Dec. 21, 2016 and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/385,916, entitled SURGICAL         STAPLING SYSTEMS, now U.S. Patent Application Publication No.         2018/0168575, now abandoned;     -   U.S. patent application Ser. No. 15/385,918, entitled SURGICAL         STAPLING SYSTEMS, now U.S. Patent Application Publication No.         2018/0168618, now abandoned;     -   U.S. patent application Ser. No. 15/385,919, entitled SURGICAL         STAPLING SYSTEMS, now U.S. Patent Application Publication No.         2018/0168619, now abandoned;     -   U.S. patent application Ser. No. 15/385,921, entitled SURGICAL         STAPLE CARTRIDGE WITH MOVABLE CAMMING MEMBER CONFIGURED TO         DISENGAGE FIRING MEMBER LOCKOUT FEATURES, now U.S. Patent         Application Publication No. 2018/0168621, issued as U.S. Pat.         No. 10,687,809 on Jun. 23, 2020;     -   U.S. patent application Ser. No. 15/385,923, entitled SURGICAL         STAPLING SYSTEMS, now U.S. Patent Application Publication No.         2018/0168623, now abandoned;     -   U.S. patent application Ser. No. 15/385,925, entitled JAW         ACTUATED LOCK ARRANGEMENTS FOR PREVENTING ADVANCEMENT OF A         FIRING MEMBER IN A SURGICAL END EFFECTOR UNLESS AN UNFIRED         CARTRIDGE IS INSTALLED IN THE END EFFECTOR, now U.S. Pat. No.         10,517,595;     -   U.S. patent application Ser. No. 15/385,926, entitled AXIALLY         MOVABLE CLOSURE SYSTEM ARRANGEMENTS FOR APPLYING CLOSURE MOTIONS         TO JAWS OF SURGICAL INSTRUMENTS, now U.S. Patent Application         Publication No. 2018/0168577, now abandoned;     -   U.S. patent application Ser. No. 15/385,928, entitled PROTECTIVE         COVER ARRANGEMENTS FOR A JOINT INTERFACE BETWEEN A MOVABLE JAW         AND ACTUATOR SHAFT OF A SURGICAL INSTRUMENT, now U.S. Patent         Application Publication No. 2018/0168578, issued as U.S. Pat.         No. 11,191,540 on Dec. 7, 2021;     -   U.S. patent application Ser. No. 15/385,930, entitled SURGICAL         END EFFECTOR WITH TWO SEPARATE COOPERATING OPENING FEATURES FOR         OPENING AND CLOSING END EFFECTOR JAWS, now U.S. Patent         Application Publication No. 2018/0168579, now abandoned;     -   U.S. patent application Ser. No. 15/385,932, entitled         ARTICULATABLE SURGICAL END EFFECTOR WITH ASYMMETRIC SHAFT         ARRANGEMENT, now U.S. Patent Application Publication No.         2018/0168628, issued as U.S. Pat. No. 10,959,727 on Mar. 30,         2021;     -   U.S. patent application Ser. No. 15/385,933, entitled         ARTICULATABLE SURGICAL INSTRUMENT WITH INDEPENDENT PIVOTABLE         LINKAGE DISTAL OF AN ARTICULATION LOCK, now U.S. Pat. No.         10,603,036;     -   U.S. patent application Ser. No. 15/385,934, entitled         ARTICULATION LOCK ARRANGEMENTS FOR LOCKING AN END EFFECTOR IN AN         ARTICULATED POSITION IN RESPONSE TO ACTUATION OF A JAW CLOSURE         SYSTEM, now U.S. Pat. No. 10,582,928;     -   U.S. patent application Ser. No. 15/385,935, entitled LATERALLY         ACTUATABLE ARTICULATION LOCK ARRANGEMENTS FOR LOCKING AN END         EFFECTOR OF A SURGICAL INSTRUMENT IN AN ARTICULATED         CONFIGURATION, now U.S. Patent Application Publication No.         10,524,789; and     -   U.S. patent application Ser. No. 15/385,936, entitled         ARTICULATABLE SURGICAL INSTRUMENTS WITH ARTICULATION STROKE         AMPLIFICATION FEATURES, now U.S. Pat. No. 10,517,596.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Jun. 24, 2016, and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. patent application Ser. No. 15/191,775, entitled STAPLE         CARTRIDGE COMPRISING WIRE STAPLES AND STAMPED STAPLES, now U.S.         Patent Application Publication No. 2017/0367695, issued as U.S.         Pat. No. 11,000,278 on May 11, 2021;     -   U.S. patent application Ser. No. 15/191,807, entitled STAPLING         SYSTEM FOR USE WITH WIRE STAPLES AND STAMPED STAPLES, now U.S.         Patent Application Publication No. 2017/0367696, issued as U.S.         Pat. No. 10,702,270 on Jul. 7, 2020;     -   U.S. patent application Ser. No. 15/191,834, entitled STAMPED         STAPLES AND STAPLE CARTRIDGES USING THE SAME, now U.S. Pat. No.         10,542,979;     -   U.S. patent application Ser. No. 15/191,788, entitled STAPLE         CARTRIDGE COMPRISING OVERDRIVEN STAPLES, now U.S. Patent         Application Publication No. 2017/0367698, issued as U.S. Pat.         No. 10,675,024 on Jun. 9, 2020; and     -   U.S. patent application Ser. No. 15/191,818, entitled STAPLE         CARTRIDGE COMPRISING OFFSET LONGITUDINAL STAPLE ROWS, now U.S.         Patent Application Publication No. 2017/0367697, issued as U.S.         Pat. No. 10,893,863 on Jan. 19, 2021.

Applicant of the present application owns the following U.S. Patent Applications that were filed on Jun. 24, 2016 and which are each herein incorporated by reference in their respective entireties:

-   -   U.S. Design patent application Ser. No. 29/569,218, entitled         SURGICAL FASTENER, now U.S. Pat. No. D826,405;     -   U.S. Design patent application Ser. No. 29/569,227, entitled         SURGICAL FASTENER, now U.S. Pat. No. D822,206;     -   U.S. Design patent application Ser. No. 29/569,259, entitled         SURGICAL FASTENER CARTRIDGE, now U.S. Pat. No. D847,989; and     -   U.S. Design patent application Ser. No. 29/569,264, entitled         SURGICAL FASTENER CARTRIDGE, now U.S. Pat. No. D850,617.

Applicant of the present application owns the following patent applications that were filed on Apr. 1, 2016 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 15/089,325, entitled METHOD FOR         OPERATING A SURGICAL STAPLING SYSTEM, now U.S. Patent         Application Publication No. 2017/0281171, issued as U.S. Pat.         No. 11,045,191 on Jun. 29, 2021;     -   U.S. patent application Ser. No. 15/089,321, entitled MODULAR         SURGICAL STAPLING SYSTEM COMPRISING A DISPLAY, now U.S. Pat. No.         10,271,851;     -   U.S. patent application Ser. No. 15/089,326, entitled SURGICAL         STAPLING SYSTEM COMPRISING A DISPLAY INCLUDING A RE-ORIENTABLE         DISPLAY FIELD, now U.S. Pat. No. 10,433,849;     -   U.S. patent application Ser. No. 15/089,263, entitled SURGICAL         INSTRUMENT HANDLE ASSEMBLY WITH RECONFIGURABLE GRIP PORTION, now         U.S. Pat. No. 10,307,159;     -   U.S. patent application Ser. No. 15/089,262, entitled ROTARY         POWERED SURGICAL INSTRUMENT WITH MANUALLY ACTUATABLE BAILOUT         SYSTEM, now U.S. Pat. No. 10,357,246;     -   U.S. patent application Ser. No. 15/089,277, entitled SURGICAL         CUTTING AND STAPLING END EFFECTOR WITH ANVIL CONCENTRIC DRIVE         MEMBER, now U.S. Pat. No. 10,531,874;     -   U.S. patent application Ser. No. 15/089,296, entitled         INTERCHANGEABLE SURGICAL TOOL ASSEMBLY WITH A SURGICAL END         EFFECTOR THAT IS SELECTIVELY ROTATABLE ABOUT A SHAFT AXIS, now         U.S. Pat. No. 10,413,293;     -   U.S. patent application Ser. No. 15/089,258, entitled SURGICAL         STAPLING SYSTEM COMPRISING A SHIFTABLE TRANSMISSION, now U.S.         Pat. No. 10,342,543;     -   U.S. patent application Ser. No. 15/089,278, entitled SURGICAL         STAPLING SYSTEM CONFIGURED TO PROVIDE SELECTIVE CUTTING OF         TISSUE, now U.S. Pat. No. 10,420,552;     -   U.S. patent application Ser. No. 15/089,284, entitled SURGICAL         STAPLING SYSTEM COMPRISING A CONTOURABLE SHAFT, now U.S. Patent         Application Publication No. 2017/0281186, now abandoned;     -   U.S. patent application Ser. No. 15/089,295, entitled SURGICAL         STAPLING SYSTEM COMPRISING A TISSUE COMPRESSION LOCKOUT, now         U.S. Patent Application Publication No. 2017/0281187, issued as         U.S. Pat. No. 10,856,867 on Dec. 8, 2020;     -   U.S. patent application Ser. No. 15/089,300, entitled SURGICAL         STAPLING SYSTEM COMPRISING AN UNCLAMPING LOCKOUT, now U.S. Pat.         No. 10,456,140;     -   U.S. patent application Ser. No. 15/089,196, entitled SURGICAL         STAPLING SYSTEM COMPRISING A JAW CLOSURE LOCKOUT, now U.S. Pat.         No. 10,568,632;     -   U.S. patent application Ser. No. 15/089,203, entitled SURGICAL         STAPLING SYSTEM COMPRISING A JAW ATTACHMENT LOCKOUT, now U.S.         Pat. No. 10,542,991;     -   U.S. patent application Ser. No. 15/089,210, entitled SURGICAL         STAPLING SYSTEM COMPRISING A SPENT CARTRIDGE LOCKOUT, now U.S.         Pat. No. 10,478,190;     -   U.S. patent application Ser. No. 15/089,324, entitled SURGICAL         INSTRUMENT COMPRISING A SHIFTING MECHANISM, now U.S. Pat. No.         10,314,582;     -   U.S. patent application Ser. No. 15/089,335, entitled SURGICAL         STAPLING INSTRUMENT COMPRISING MULTIPLE LOCKOUTS, now U.S. Pat.         No. 10,485,542;     -   U.S. patent application Ser. No. 15/089,339, entitled SURGICAL         STAPLING INSTRUMENT, now U.S. Patent Application Publication No.         2017/0281173, issued as U.S. Pat. No. 11,064,997 on Jul. 20,         2021;     -   U.S. patent application Ser. No. 15/089,253, entitled SURGICAL         STAPLING SYSTEM CONFIGURED TO APPLY ANNULAR ROWS OF STAPLES         HAVING DIFFERENT HEIGHTS, now U.S. Pat. No. 10,413,297;     -   U.S. patent application Ser. No. 15/089,304, entitled SURGICAL         STAPLING SYSTEM COMPRISING A GROOVED FORMING POCKET, now U.S.         Pat. No. 10,285,705;     -   U.S. patent application Ser. No. 15/089,331, entitled ANVIL         MODIFICATION MEMBERS FOR SURGICAL STAPLERS, now U.S. Pat. No.         10,376,263;     -   U.S. patent application Ser. No. 15/089,336, entitled STAPLE         CARTRIDGES WITH ATRAUMATIC FEATURES, now U.S. Patent Application         Publication No. 2017/0281164, issued as U.S. Pat. No. 10,709,446         on Jul. 14, 2020;     -   U.S. patent application Ser. No. 15/089,312, entitled CIRCULAR         STAPLING SYSTEM COMPRISING AN INCISABLE TISSUE SUPPORT, now U.S.         Patent Application Publication No. 2017/0281189, issued as U.S.         Pat. No. 11,284,890 on Mar. 29, 2022;     -   U.S. patent application Ser. No. 15/089,309, entitled CIRCULAR         STAPLING SYSTEM COMPRISING ROTARY FIRING SYSTEM, now U.S. Patent         Application Publication No. 2017/0281169, issued as U.S. Pat.         No. 10,675,021 on Jun. 9, 2020; and     -   U.S. patent application Ser. No. 15/089,349, entitled CIRCULAR         STAPLING SYSTEM COMPRISING LOAD CONTROL, now U.S. Patent         Application Publication No. 2017/0281174, issued as U.S. Pat.         No. 10,682,136 Jun. 16, 2020.

Applicant of the present application also owns the U.S. Patent Applications identified below which were filed on Dec. 31, 2015 which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/984,488, entitled MECHANISMS         FOR COMPENSATING FOR BATTERY PACK FAILURE IN POWERED SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,292,704;     -   U.S. patent application Ser. No. 14/984,525, entitled MECHANISMS         FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,368,865; and     -   U.S. patent application Ser. No. 14/984,552, entitled SURGICAL         INSTRUMENTS WITH SEPARABLE MOTORS AND MOTOR CONTROL CIRCUITS,         now U.S. Pat. No. 10,265,068.

Applicant of the present application also owns the U.S. Patent Applications identified below which were filed on Feb. 9, 2016 which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 15/019,220, entitled SURGICAL         INSTRUMENT WITH ARTICULATING AND AXIALLY TRANSLATABLE END         EFFECTOR, now U.S. Pat. No. 10,245,029;     -   U.S. patent application Ser. No. 15/019,228, entitled SURGICAL         INSTRUMENTS WITH MULTIPLE LINK ARTICULATION ARRANGEMENTS, now         U.S. Pat. No. 10,433,837;     -   U.S. patent application Ser. No. 15/019,196, entitled SURGICAL         INSTRUMENT ARTICULATION MECHANISM WITH SLOTTED SECONDARY         CONSTRAINT, now U.S. Pat. No. 10,413,291;     -   U.S. patent application Ser. No. 15/019,206, entitled SURGICAL         INSTRUMENTS WITH AN END EFFECTOR THAT IS HIGHLY ARTICULATABLE         RELATIVE TO AN ELONGATE SHAFT ASSEMBLY, now U.S. Patent         Application Publication No. 2017/0224331, issued as U.S. Pat.         No. 10,653,413 on May 19, 2020;     -   U.S. patent application Ser. No. 15/019,215, entitled SURGICAL         INSTRUMENTS WITH NON-SYMMETRICAL ARTICULATION ARRANGEMENTS, now         U.S. Patent Application Publication No. 2017/0224332, now         abandoned;     -   U.S. patent application Ser. No. 15/019,227, entitled         ARTICULATABLE SURGICAL INSTRUMENTS WITH SINGLE ARTICULATION LINK         ARRANGEMENTS, now U.S. Patent Application Publication No.         2017/0224334, issued as U.S. Pat. No. 11,213,293 on Jan. 4,         2022;     -   U.S. patent application Ser. No. 15/019,235, entitled SURGICAL         INSTRUMENTS WITH TENSIONING ARRANGEMENTS FOR CABLE DRIVEN         ARTICULATION SYSTEMS, now U.S. Pat. No. 10,245,030;     -   U.S. patent application Ser. No. 15/019,230, entitled         ARTICULATABLE SURGICAL INSTRUMENTS WITH OFF-AXIS FIRING BEAM         ARRANGEMENTS, now U.S. Pat. No. 10,588,625; and     -   U.S. patent application Ser. No. 15/019,245, entitled SURGICAL         INSTRUMENTS WITH CLOSURE STROKE REDUCTION ARRANGEMENTS, now U.S.         Pat. No. 10,470,764.

Applicant of the present application also owns the U.S. Patent Applications identified below which were filed on Feb. 12, 2016, which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 15/043,254, entitled MECHANISMS         FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,258,331;     -   U.S. patent application Ser. No. 15/043,259, entitled MECHANISMS         FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,448,948;     -   U.S. patent application Ser. No. 15/043,275, entitled MECHANISMS         FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL         INSTRUMENTS, now U.S. Patent Application Publication No.         2017/0231627, issued as U.S. Pat. No. 11,224,426 on Jan. 18,         2022; and     -   U.S. patent application Ser. No. 15/043,289, entitled MECHANISMS         FOR COMPENSATING FOR DRIVETRAIN FAILURE IN POWERED SURGICAL         INSTRUMENTS, now U.S. Patent Application Publication No.         2017/0231628, now abandoned.

Applicant of the present application owns the following patent applications that were filed on Jun. 18, 2015 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/742,925, entitled SURGICAL         END EFFECTORS WITH POSITIVE JAW OPENING ARRANGEMENTS, now U.S.         Pat. No. 10,182,818;     -   U.S. patent application Ser. No. 14/742,941, entitled SURGICAL         END EFFECTORS WITH DUAL CAM ACTUATED JAW CLOSING FEATURES, now         U.S. Pat. No. 10,052,102;     -   U.S. patent application Ser. No. 14/742,914, entitled MOVABLE         FIRING BEAM SUPPORT ARRANGEMENTS FOR ARTICULATABLE SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,405,863;     -   U.S. patent application Ser. No. 14/742,900, entitled         ARTICULATABLE SURGICAL INSTRUMENTS WITH COMPOSITE FIRING BEAM         STRUCTURES WITH CENTER FIRING SUPPORT MEMBER FOR ARTICULATION         SUPPORT, now U.S. Pat. No. 10,335,149;     -   U.S. patent application Ser. No. 14/742,885, entitled DUAL         ARTICULATION DRIVE SYSTEM ARRANGEMENTS FOR ARTICULATABLE         SURGICAL INSTRUMENTS, now U.S. Pat. No. 10,368,861; and     -   U.S. patent application Ser. No. 14/742,876, entitled PUSH/PULL         ARTICULATION DRIVE SYSTEMS FOR ARTICULATABLE SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,178,992.

Applicant of the present application owns the following patent applications that were filed on Mar. 6, 2015, and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/640,746, entitled POWERED         SURGICAL INSTRUMENT, now U.S. Pat. No. 9,808,246;     -   U.S. patent application Ser. No. 14/640,795, entitled MULTIPLE         LEVEL THRESHOLDS TO MODIFY OPERATION OF POWERED SURGICAL         INSTRUMENTS, now U.S. Pat. No. 10,441,279;     -   U.S. patent application Ser. No. 14/640,832, entitled ADAPTIVE         TISSUE COMPRESSION TECHNIQUES TO ADJUST CLOSURE RATES FOR         MULTIPLE TISSUE TYPES, now U.S. Patent Application Publication         No. 2016/0256154, issued as U.S. Pat. No. 10,687,806 on Jun. 23,         2020;     -   U.S. patent application Ser. No. 14/640,935, entitled OVERLAID         MULTI SENSOR RADIO FREQUENCY (RF) ELECTRODE SYSTEM TO MEASURE         TISSUE COMPRESSION, now U.S. Pat. No. 10,548,504;     -   U.S. patent application Ser. No. 14/640,831, entitled MONITORING         SPEED CONTROL AND PRECISION INCREMENTING OF MOTOR FOR POWERED         SURGICAL INSTRUMENTS, now U.S. Pat. No. 9,895,148;     -   U.S. patent application Ser. No. 14/640,859, entitled TIME         DEPENDENT EVALUATION OF SENSOR DATA TO DETERMINE STABILITY,         CREEP, AND VISCOELASTIC ELEMENTS OF MEASURES, now U.S. Pat. No.         10,052,044;     -   U.S. patent application Ser. No. 14/640,817, entitled         INTERACTIVE FEEDBACK SYSTEM FOR POWERED SURGICAL INSTRUMENTS,         U.S. Pat. No. 9,924,961;     -   U.S. patent application Ser. No. 14/640,844, entitled CONTROL         TECHNIQUES AND SUB-PROCESSOR CONTAINED WITHIN MODULAR SHAFT WITH         SELECT CONTROL PROCESSING FROM HANDLE, now U.S. Pat. No.         10,045,776;     -   U.S. patent application Ser. No. 14/640,837, entitled SMART         SENSORS WITH LOCAL SIGNAL PROCESSING, now U.S. Pat. No.         9,993,248;     -   U.S. patent application Ser. No. 14/640,765, entitled SYSTEM FOR         DETECTING THE MIS-INSERTION OF A STAPLE CARTRIDGE INTO A         SURGICAL STAPLER, now U.S. Pat. No. 10,617,412;     -   U.S. patent application Ser. No. 14/640,799, entitled SIGNAL AND         POWER COMMUNICATION SYSTEM POSITIONED ON A ROTATABLE SHAFT, now         U.S. Pat. No. 9,901,342; and     -   U.S. patent application Ser. No. 14/640,780, entitled SURGICAL         INSTRUMENT COMPRISING A LOCKABLE BATTERY HOUSING, now U.S. Pat.         No. 10,245,033.

Applicant of the present application owns the following patent applications that were filed on Feb. 27, 2015, and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/633,576, entitled SURGICAL         INSTRUMENT SYSTEM COMPRISING AN INSPECTION STATION, now U.S.         Pat. No. 10,045,779;     -   U.S. patent application Ser. No. 14/633,546, entitled SURGICAL         APPARATUS CONFIGURED TO ASSESS WHETHER A PERFORMANCE PARAMETER         OF THE SURGICAL APPARATUS IS WITHIN AN ACCEPTABLE PERFORMANCE         BAND, now U.S. Pat. No. 10,180,463;     -   U.S. patent application Ser. No. 14/633,560, entitled SURGICAL         CHARGING SYSTEM THAT CHARGES AND/OR CONDITIONS ONE OR MORE         BATTERIES, now U.S. Patent Application Publication No.         2016/0249910, now abandoned;     -   U.S. patent application Ser. No. 14/633,566, entitled CHARGING         SYSTEM THAT ENABLES EMERGENCY RESOLUTIONS FOR CHARGING A         BATTERY, now U.S. Pat. No. 10,182,816;     -   U.S. patent application Ser. No. 14/633,555, entitled SYSTEM FOR         MONITORING WHETHER A SURGICAL INSTRUMENT NEEDS TO BE SERVICED,         now U.S. Pat. No. 10,321,907;     -   U.S. patent application Ser. No. 14/633,542, entitled REINFORCED         BATTERY FOR A SURGICAL INSTRUMENT, now U.S. Pat. No. 9,931,118;     -   U.S. patent application Ser. No. 14/633,548, entitled POWER         ADAPTER FOR A SURGICAL INSTRUMENT, now U.S. Pat. No. 10,245,028;     -   U.S. patent application Ser. No. 14/633,526, entitled ADAPTABLE         SURGICAL INSTRUMENT HANDLE, now U.S. Pat. No. 9,993,258;     -   U.S. patent application Ser. No. 14/633,541, entitled MODULAR         STAPLING ASSEMBLY, now U.S. Pat. No. 10,226,250; and     -   U.S. patent application Ser. No. 14/633,562, entitled SURGICAL         APPARATUS CONFIGURED TO TRACK AN END-OF-LIFE PARAMETER, now U.S.         Pat. No. 10,159,483.

Applicant of the present application owns the following patent applications that were filed on Dec. 18, 2014 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/574,478, entitled SURGICAL         INSTRUMENT SYSTEMS COMPRISING AN ARTICULATABLE END EFFECTOR AND         MEANS FOR ADJUSTING THE FIRING STROKE OF A FIRING MEMBER, now         U.S. Pat. No. 9,844,374;     -   U.S. patent application Ser. No. 14/574,483, entitled SURGICAL         INSTRUMENT ASSEMBLY COMPRISING LOCKABLE SYSTEMS, now U.S. Pat.         No. 10,188,385;     -   U.S. patent application Ser. No. 14/575,139, entitled DRIVE         ARRANGEMENTS FOR ARTICULATABLE SURGICAL INSTRUMENTS, now U.S.         Pat. No. 9,844,375;     -   U.S. patent application Ser. No. 14/575,148, entitled LOCKING         ARRANGEMENTS FOR DETACHABLE SHAFT ASSEMBLIES WITH ARTICULATABLE         SURGICAL END EFFECTORS, now U.S. Pat. No. 10,085,748;     -   U.S. patent application Ser. No. 14/575,130, entitled SURGICAL         INSTRUMENT WITH AN ANVIL THAT IS SELECTIVELY MOVABLE ABOUT A         DISCRETE NON-MOVABLE AXIS RELATIVE TO A STAPLE CARTRIDGE, now         U.S. Pat. No. 10,245,027;     -   U.S. patent application Ser. No. 14/575,143, entitled SURGICAL         INSTRUMENTS WITH IMPROVED CLOSURE ARRANGEMENTS, now U.S. Pat.         No. 10,004,501;     -   U.S. patent application Ser. No. 14/575,117, entitled SURGICAL         INSTRUMENTS WITH ARTICULATABLE END EFFECTORS AND MOVABLE FIRING         BEAM SUPPORT ARRANGEMENTS, now U.S. Pat. No. 9,943,309;     -   U.S. patent application Ser. No. 14/575,154, entitled SURGICAL         INSTRUMENTS WITH ARTICULATABLE END EFFECTORS AND IMPROVED FIRING         BEAM SUPPORT ARRANGEMENTS, now U.S. Pat. No. 9,968,355;     -   U.S. patent application Ser. No. 14/574,493, entitled SURGICAL         INSTRUMENT ASSEMBLY COMPRISING A FLEXIBLE ARTICULATION SYSTEM,         now U.S. Pat. No. 9,987,000; and     -   U.S. patent application Ser. No. 14/574,500, entitled SURGICAL         INSTRUMENT ASSEMBLY COMPRISING A LOCKABLE ARTICULATION SYSTEM,         now U.S. Pat. No. 10,117,649.

Applicant of the present application owns the following patent applications that were filed on Mar. 1, 2013, and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 13/782,295, entitled         ARTICULATABLE SURGICAL INSTRUMENTS WITH CONDUCTIVE PATHWAYS FOR         SIGNAL COMMUNICATION, now U.S. Pat. No. 9,700,309;     -   U.S. patent application Ser. No. 13/782,323, entitled ROTARY         POWERED ARTICULATION JOINTS FOR SURGICAL INSTRUMENTS, now U.S.         Pat. No. 9,782,169;     -   U.S. patent application Ser. No. 13/782,338, entitled THUMBWHEEL         SWITCH ARRANGEMENTS FOR SURGICAL INSTRUMENTS, now U.S. Patent         Application Publication No. 2014/0249557, now abandoned;     -   U.S. patent application Ser. No. 13/782,499, entitled         ELECTROMECHANICAL SURGICAL DEVICE WITH SIGNAL RELAY ARRANGEMENT,         now U.S. Pat. No. 9,358,003;     -   U.S. patent application Ser. No. 13/782,460, entitled MULTIPLE         PROCESSOR MOTOR CONTROL FOR MODULAR SURGICAL INSTRUMENTS, now         U.S. Pat. No. 9,554,794;     -   U.S. patent application Ser. No. 13/782,358, entitled JOYSTICK         SWITCH ASSEMBLIES FOR SURGICAL INSTRUMENTS, now U.S. Pat. No.         9,326,767;     -   U.S. patent application Ser. No. 13/782,481, entitled SENSOR         STRAIGHTENED END EFFECTOR DURING REMOVAL THROUGH TROCAR, now         U.S. Pat. No. 9,468,438;     -   U.S. patent application Ser. No. 13/782,518, entitled CONTROL         METHODS FOR SURGICAL INSTRUMENTS WITH REMOVABLE IMPLEMENT         PORTIONS, now U.S. Patent Application Publication No.         2014/0246475, now abandoned;     -   U.S. patent application Ser. No. 13/782,375, entitled ROTARY         POWERED SURGICAL INSTRUMENTS WITH MULTIPLE DEGREES OF FREEDOM,         now U.S. Pat. No. 9,398,911; and     -   U.S. patent application Ser. No. 13/782,536, entitled SURGICAL         INSTRUMENT SOFT STOP, now U.S. Pat. No. 9,307,986.

Applicant of the present application also owns the following patent applications that were filed on Mar. 14, 2013 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 13/803,097, entitled         ARTICULATABLE SURGICAL INSTRUMENT COMPRISING A FIRING DRIVE, now         U.S. Pat. No. 9,687,230;     -   U.S. patent application Ser. No. 13/803,193, entitled CONTROL         ARRANGEMENTS FOR A DRIVE MEMBER OF A SURGICAL INSTRUMENT, now         U.S. Pat. No. 9,332,987;     -   U.S. patent application Ser. No. 13/803,053, entitled         INTERCHANGEABLE SHAFT ASSEMBLIES FOR USE WITH A SURGICAL         INSTRUMENT, now U.S. Pat. No. 9,883,860;     -   U.S. patent application Ser. No. 13/803,086, entitled         ARTICULATABLE SURGICAL INSTRUMENT COMPRISING AN ARTICULATION         LOCK, now U.S. Patent Application Publication No. 2014/0263541,         now abandoned;     -   U.S. patent application Ser. No. 13/803,210, entitled SENSOR         ARRANGEMENTS FOR ABSOLUTE POSITIONING SYSTEM FOR SURGICAL         INSTRUMENTS, now U.S. Pat. No. 9,808,244;     -   U.S. patent application Ser. No. 13/803,148, entitled         MULTI-FUNCTION MOTOR FOR A SURGICAL INSTRUMENT, now U.S. Pat.         No. 10,470,762;     -   U.S. patent application Ser. No. 13/803,066, entitled DRIVE         SYSTEM LOCKOUT ARRANGEMENTS FOR MODULAR SURGICAL INSTRUMENTS,         now U.S. Pat. No. 9,629,623;     -   U.S. patent application Ser. No. 13/803,117, entitled         ARTICULATION CONTROL SYSTEM FOR ARTICULATABLE SURGICAL         INSTRUMENTS, now U.S. Pat. No. 9,351,726;     -   U.S. patent application Ser. No. 13/803,130, entitled DRIVE         TRAIN CONTROL ARRANGEMENTS FOR MODULAR SURGICAL INSTRUMENTS, now         U.S. Pat. No. 9,351,727; and     -   U.S. patent application Ser. No. 13/803,159, entitled METHOD AND         SYSTEM FOR OPERATING A SURGICAL INSTRUMENT, now U.S. Pat. No.         9,888,919.

Applicant of the present application also owns the following patent application that was filed on Mar. 7, 2014 and is herein incorporated by reference in its entirety:

-   -   U.S. patent application Ser. No. 14/200,111, entitled CONTROL         SYSTEMS FOR SURGICAL INSTRUMENTS, now U.S. Pat. No. 9,629,629.

Applicant of the present application also owns the following patent applications that were filed on Mar. 26, 2014, and are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/226,106, entitled POWER         MANAGEMENT CONTROL SYSTEMS FOR SURGICAL INSTRUMENTS, now U.S.         Patent Application Publication No. 2015/0272582, now abandoned;     -   U.S. patent application Ser. No. 14/226,099, entitled         STERILIZATION VERIFICATION CIRCUIT, now U.S. Pat. No. 9,826,977;     -   U.S. patent application Ser. No. 14/226,094, entitled         VERIFICATION OF NUMBER OF BATTERY EXCHANGES/PROCEDURE COUNT, now         U.S. Patent Application Publication No. 2015/0272580, now         abandoned;     -   U.S. patent application Ser. No. 14/226,117, entitled POWER         MANAGEMENT THROUGH SLEEP OPTIONS OF SEGMENTED CIRCUIT AND WAKE         UP CONTROL, now U.S. Pat. No. 10,013,049;     -   U.S. patent application Ser. No. 14/226,075, entitled MODULAR         POWERED SURGICAL INSTRUMENT WITH DETACHABLE SHAFT ASSEMBLIES,         now U.S. Pat. No. 9,743,929;     -   U.S. patent application Ser. No. 14/226,093, entitled FEEDBACK         ALGORITHMS FOR MANUAL BAILOUT SYSTEMS FOR SURGICAL INSTRUMENTS,         now U.S. Pat. No. 10,028,761;     -   U.S. patent application Ser. No. 14/226,116, entitled SURGICAL         INSTRUMENT UTILIZING SENSOR ADAPTATION, now U.S. Patent         Application Publication No. 2015/0272571, now abandoned;     -   U.S. patent application Ser. No. 14/226,071, entitled SURGICAL         INSTRUMENT CONTROL CIRCUIT HAVING A SAFETY PROCESSOR, now U.S.         Pat. No. 9,690,362;     -   U.S. patent application Ser. No. 14/226,097, entitled SURGICAL         INSTRUMENT COMPRISING INTERACTIVE SYSTEMS, now U.S. Pat. No.         9,820,738;     -   U.S. patent application Ser. No. 14/226,126, entitled INTERFACE         SYSTEMS FOR USE WITH SURGICAL INSTRUMENTS, now U.S. Pat. No.         10,004,497;     -   U.S. patent application Ser. No. 14/226,133, entitled MODULAR         SURGICAL INSTRUMENT SYSTEM, now U.S. Patent Application         Publication No. 2015/0272557, now abandoned;     -   U.S. patent application Ser. No. 14/226,081, entitled SYSTEMS         AND METHODS FOR CONTROLLING A SEGMENTED CIRCUIT, now U.S. Pat.         No. 9,804,618;     -   U.S. patent application Ser. No. 14/226,076, entitled POWER         MANAGEMENT THROUGH SEGMENTED CIRCUIT AND VARIABLE VOLTAGE         PROTECTION, now U.S. Pat. No. 9,733,663;     -   U.S. patent application Ser. No. 14/226,111, entitled SURGICAL         STAPLING INSTRUMENT SYSTEM, now U.S. Pat. No. 9,750,499; and     -   U.S. patent application Ser. No. 14/226,125, entitled SURGICAL         INSTRUMENT COMPRISING A ROTATABLE SHAFT, now U.S. Pat. No.         10,201,364.

Applicant of the present application also owns the following patent applications that were filed on Sep. 5, 2014, and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/479,103, entitled CIRCUITRY         AND SENSORS FOR POWERED MEDICAL DEVICE, now U.S. Pat. No.         10,111,679;     -   U.S. patent application Ser. No. 14/479,119, entitled ADJUNCT         WITH INTEGRATED SENSORS TO QUANTIFY TISSUE COMPRESSION, now U.S.         Pat. No. 9,724,094;     -   U.S. patent application Ser. No. 14/478,908, entitled MONITORING         DEVICE DEGRADATION BASED ON COMPONENT EVALUATION, now U.S. Pat.         No. 9,737,301;     -   U.S. patent application Ser. No. 14/478,895, entitled MULTIPLE         SENSORS WITH ONE SENSOR AFFECTING A SECOND SENSOR'S OUTPUT OR         INTERPRETATION, now U.S. Pat. No. 9,757,128;     -   U.S. patent application Ser. No. 14/479,110, entitled POLARITY         OF HALL MAGNET TO DETECT MISLOADED CARTRIDGE, now U.S. Pat. No.         10,016,199;     -   U.S. patent application Ser. No. 14/479,098, entitled SMART         CARTRIDGE WAKE UP OPERATION AND DATA RETENTION, now U.S. Pat.         No. 10,135,242;     -   U.S. patent application Ser. No. 14/479,115, entitled MULTIPLE         MOTOR CONTROL FOR POWERED MEDICAL DEVICE, now U.S. Pat. No.         9,788,836; and     -   U.S. patent application Ser. No. 14/479,108, entitled LOCAL         DISPLAY OF TISSUE PARAMETER STABILIZATION, now U.S. Patent         Application Publication No. 2016/0066913, now abandoned.

Applicant of the present application also owns the following patent applications that were filed on Apr. 9, 2014 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/248,590, entitled MOTOR         DRIVEN SURGICAL INSTRUMENTS WITH LOCKABLE DUAL DRIVE SHAFTS, now         U.S. Pat. No. 9,826,976;     -   U.S. patent application Ser. No. 14/248,581, entitled SURGICAL         INSTRUMENT COMPRISING A CLOSING DRIVE AND A FIRING DRIVE         OPERATED FROM THE SAME ROTATABLE OUTPUT, now U.S. Pat. No.         9,649,110;     -   U.S. patent application Ser. No. 14/248,595, entitled SURGICAL         INSTRUMENT SHAFT INCLUDING SWITCHES FOR CONTROLLING THE         OPERATION OF THE SURGICAL INSTRUMENT, now U.S. Pat. No.         9,844,368;     -   U.S. patent application Ser. No. 14/248,588, entitled POWERED         LINEAR SURGICAL STAPLER, now U.S. Pat. No. 10,405,857;     -   U.S. patent application Ser. No. 14/248,591, entitled         TRANSMISSION ARRANGEMENT FOR A SURGICAL INSTRUMENT, now U.S.         Pat. No. 10,149,680;     -   U.S. patent application Ser. No. 14/248,584, entitled MODULAR         MOTOR DRIVEN SURGICAL INSTRUMENTS WITH ALIGNMENT FEATURES FOR         ALIGNING ROTARY DRIVE SHAFTS WITH SURGICAL END EFFECTOR SHAFTS,         now U.S. Pat. No. 9,801,626;     -   U.S. patent application Ser. No. 14/248,587, entitled POWERED         SURGICAL STAPLER, now U.S. Pat. No. 9,867,612;     -   U.S. patent application Ser. No. 14/248,586, entitled DRIVE         SYSTEM DECOUPLING ARRANGEMENT FOR A SURGICAL INSTRUMENT, now         U.S. Pat. No. 10,136,887; and     -   U.S. patent application Ser. No. 14/248,607, entitled MODULAR         MOTOR DRIVEN SURGICAL INSTRUMENTS WITH STATUS INDICATION         ARRANGEMENTS, now U.S. Pat. No. 9,814,460.

Applicant of the present application also owns the following patent applications that were filed on Apr. 16, 2013 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. Provisional Patent Application Ser. No. 61/812,365,         entitled SURGICAL INSTRUMENT WITH MULTIPLE FUNCTIONS PERFORMED         BY A SINGLE MOTOR;     -   U.S. Provisional Patent Application Ser. No. 61/812,376,         entitled LINEAR CUTTER WITH POWER;     -   U.S. Provisional Patent Application Ser. No. 61/812,382,         entitled LINEAR CUTTER WITH MOTOR AND PISTOL GRIP;     -   U.S. Provisional Patent Application Ser. No. 61/812,385,         entitled SURGICAL INSTRUMENT HANDLE WITH MULTIPLE ACTUATION         MOTORS AND MOTOR CONTROL; and     -   U.S. Provisional Patent Application Ser. No. 61/812,372,         entitled SURGICAL INSTRUMENT WITH MULTIPLE FUNCTIONS PERFORMED         BY A SINGLE MOTOR.

Applicant of the present application also owns the following patent applications that were filed on Sep. 2, 2015 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/843,168, entitled SURGICAL         STAPLE CARTRIDGE WITH IMPROVED STAPLE DRIVER CONFIGURATIONS, now         U.S. Pat. No. 10,314,587;     -   U.S. patent application Ser. No. 14/843,196, entitled SURGICAL         STAPLE DRIVER ARRAYS, now U.S. Pat. No. 10,172,619;     -   U.S. patent application Ser. No. 14/843,216, entitled SURGICAL         STAPLE CARTRIDGE STAPLE DRIVERS WITH CENTRAL SUPPORT FEATURES,         now U.S. Pat. No. 10,251,648;     -   U.S. patent application Ser. No. 14/843,243, entitled SURGICAL         STAPLE CONFIGURATIONS WITH CAMMING SURFACES LOCATED BETWEEN         PORTIONS SUPPORTING SURGICAL STAPLES, now U.S. Pat. No.         10,357,252; and     -   U.S. patent application Ser. No. 14/843,267, entitled SURGICAL         STAPLE CARTRIDGES WITH DRIVER ARRANGEMENTS FOR ESTABLISHING         HERRINGBONE STAPLE PATTERNS, now U.S. Pat. No. 10,238,390.

Applicant of the present application also owns the following patent applications that were filed on Sep. 26, 2014 and which are each herein incorporated by reference in their respective entirety:

-   -   U.S. patent application Ser. No. 14/498,070, entitled CIRCULAR         FASTENER CARTRIDGES FOR APPLYING RADIALLY EXPANDABLE FASTENER         LINES; now U.S. Pat. No. 10,426,476;     -   U.S. patent application Ser. No. 14/498,087, entitled SURGICAL         STAPLE AND DRIVER ARRANGEMENTS FOR STAPLE CARTRIDGES; now U.S.         Pat. No. 10,206,677;     -   U.S. patent application Ser. No. 14/498,105, entitled SURGICAL         STAPLE AND DRIVER ARRANGEMENTS FOR STAPLE CARTRIDGES; now U.S.         Pat. No. 9,801,628;     -   U.S. patent application Ser. No. 14/498,121, entitled FASTENER         CARTRIDGE FOR CREATING A FLEXIBLE STAPLE LINE; now U.S. Pat. No.         9,801,627;     -   U.S. patent application Ser. No. 14/498,145, entitled METHOD FOR         CREATING A FLEXIBLE STAPLE LINE; now U.S. Pat. No. 10,327,764;         and     -   U.S. patent application Ser. No. 14/498,107, entitled SURGICAL         STAPLING BUTTRESSES AND ADJUNCT MATERIALS; now U.S. Pat. No.         9,943,310.

Applicant of the present application also owns U.S. Pat. No. 8,590,762, which issued Nov. 26, 2013, entitled STAPLE CARTRIDGE CAVITY CONFIGURATIONS, which is herein incorporated by reference in its respective entirety.

Applicant of the present application also owns U.S. Pat. No. 8,727,197, which issued May 20, 2014, entitled STAPLE CARTRIDGE CAVITY CONFIGURATION WITH COOPERATIVE SURGICAL STAPLE, which is herein incorporated by reference in its respective entirety.

Numerous specific details are set forth to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. Well-known operations, components, and elements have not been described in detail so as not to obscure the embodiments described in the specification. The reader will understand that the embodiments described and illustrated herein are non-limiting examples, and thus it can be appreciated that the specific structural and functional details disclosed herein may be representative and illustrative. Variations and changes thereto may be made without departing from the scope of the claims.

The terms “comprise” (and any form of comprise, such as “comprises” and “comprising”), “have” (and any form of have, such as “has” and “having”), “include” (and any form of include, such as “includes” and “including”) and “contain” (and any form of contain, such as “contains” and “containing”) are open-ended linking verbs. As a result, a surgical system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more elements possesses those one or more elements, but is not limited to possessing only those one or more elements. Likewise, an element of a system, device, or apparatus that “comprises,” “has,” “includes” or “contains” one or more features possesses those one or more features, but is not limited to possessing only those one or more features.

The terms “proximal” and “distal” are used herein with reference to a clinician manipulating the handle portion of the surgical instrument. The term “proximal” refers to the portion closest to the clinician and the term “distal” refers to the portion located away from the clinician. It will be further appreciated that, for convenience and clarity, spatial terms such as “vertical”, “horizontal”, “up”, and “down” may be used herein with respect to the drawings. However, surgical instruments are used in many orientations and positions, and these terms are not intended to be limiting and/or absolute.

Various exemplary devices and methods are provided for performing laparoscopic and minimally invasive surgical procedures. However, the reader will readily appreciate that the various methods and devices disclosed herein can be used in numerous surgical procedures and applications including, for example, in connection with open surgical procedures. As the present Detailed Description proceeds, the reader will further appreciate that the various instruments disclosed herein can be inserted into a body in any way, such as through a natural orifice, through an incision or puncture hole formed in tissue, etc. The working portions or end effector portions of the instruments can be inserted directly into a patient's body or can be inserted through an access device that has a working channel through which the end effector and elongate shaft of a surgical instrument can be advanced.

A surgical stapling system can comprise a shaft and an end effector extending from the shaft. The end effector comprises a first jaw and a second jaw. The first jaw comprises a staple cartridge. The staple cartridge is insertable into and removable from the first jaw; however, other embodiments are envisioned in which a staple cartridge is not removable from, or at least readily replaceable from, the first jaw. The second jaw comprises an anvil configured to deform staples ejected from the staple cartridge. The second jaw is pivotable relative to the first jaw about a closure axis; however, other embodiments are envisioned in which first jaw is pivotable relative to the second jaw. The surgical stapling system further comprises an articulation joint configured to permit the end effector to be rotated, or articulated, relative to the shaft. The end effector is rotatable about an articulation axis extending through the articulation joint. Other embodiments are envisioned which do not include an articulation joint.

The staple cartridge comprises a cartridge body. The cartridge body includes a proximal end, a distal end, and a deck extending between the proximal end and the distal end. In use, the staple cartridge is positioned on a first side of the tissue to be stapled and the anvil is positioned on a second side of the tissue. The anvil is moved toward the staple cartridge to compress and clamp the tissue against the deck. Thereafter, staples removably stored in the cartridge body can be deployed into the tissue. The cartridge body includes staple cavities defined therein wherein staples are removably stored in the staple cavities. The staple cavities are arranged in six longitudinal rows. Three rows of staple cavities are positioned on a first side of a longitudinal slot and three rows of staple cavities are positioned on a second side of the longitudinal slot. Other arrangements of staple cavities and staples may be possible.

The staples are supported by staple drivers in the cartridge body. The drivers are movable between a first, or unfired position, and a second, or fired, position to eject the staples from the staple cavities. The drivers are retained in the cartridge body by a retainer which extends around the bottom of the cartridge body and includes resilient members configured to grip the cartridge body and hold the retainer to the cartridge body. The drivers are movable between their unfired positions and their fired positions by a sled. The sled is movable between a proximal position adjacent the proximal end and a distal position adjacent the distal end. The sled comprises a plurality of ramped surfaces configured to slide under the drivers and lift the drivers, and the staples supported thereon, toward the anvil.

Further to the above, the sled is moved distally by a firing member. The firing member is configured to contact the sled and push the sled toward the distal end. The longitudinal slot defined in the cartridge body is configured to receive the firing member. The anvil also includes a slot configured to receive the firing member. The firing member further comprises a first cam which engages the first jaw and a second cam which engages the second jaw. As the firing member is advanced distally, the first cam and the second cam can control the distance, or tissue gap, between the deck of the staple cartridge and the anvil. The firing member also comprises a knife configured to incise the tissue captured intermediate the staple cartridge and the anvil. It is desirable for the knife to be positioned at least partially proximal to the ramped surfaces such that the staples are ejected ahead of the knife.

FIG. 1 depicts one form of an interchangeable surgical tool assembly 1000 that is operably coupled to a motor driven handle assembly 500. The tool assembly 1000 may also be effectively employed with a tool drive assembly of a robotically controlled or automated surgical system. For example, the surgical tool assemblies disclosed herein may be employed with various robotic systems, instruments, components and methods such as, but not limited to, those disclosed in U.S. Pat. No. 9,072,535, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, which is hereby incorporated by reference herein in its entirety. The handle assembly 500, as well as the tool drive assembly of a robotic system may also be referred to herein as “control systems” or “control units”.

FIG. 2 illustrates attachment of the interchangeable surgical tool assembly 1000 to the handle assembly 500. The handle assembly 500 may comprise a handle housing 502 that includes a pistol grip portion 504 that can be gripped and manipulated by the clinician. The handle assembly 500 may further include a frame 506 that operably supports the plurality of drive systems. For example, the frame 506 can operably support a “first” or closure drive system, generally designated as 510, which may be employed to apply closing and opening motions to the interchangeable surgical tool assembly 1000 that is operably attached or coupled to the handle assembly 500. In at least one form, the closure drive system 510 may include an actuator in the form of a closure trigger 512 that is pivotally supported by the frame 506. Such arrangement enables the closure trigger 512 to be manipulated by a clinician such that when the clinician grips the pistol grip portion 504 of the handle assembly 500, the closure trigger 512 may be easily pivoted from a starting or “unactuated” position to an “actuated” position and more particularly, to a fully compressed or fully actuated position. In various forms, the closure drive system 510 further includes a closure linkage assembly 514 that is pivotally coupled to the closure trigger 512 or otherwise operably interfaces therewith. As will be discussed in further detail below, in the illustrated example, the closure linkage assembly 514 includes a transverse attachment pin 516 that facilitates attachment to a corresponding drive system on the surgical tool assembly. In use, to actuate the closure drive system 510, the clinician depresses the closure trigger 512 towards the pistol grip portion 504. As described in further detail in U.S. patent application Ser. No. 14/226,142, entitled SURGICAL INSTRUMENT COMPRISING A SENSOR SYSTEM, now U.S. Pat. No. 9,913,642, which is hereby incorporated by reference in its entirety herein, when the clinician fully depresses the closure trigger 512 to attain a “full” closure stroke, the closure drive system 510 is configured to lock the closure trigger 512 into the fully depressed or fully actuated position. When the clinician desires to unlock the closure trigger 512 to permit it to be biased to the unactuated position, the clinician simply activates a closure release button assembly 518 which enables the closure trigger 512 to return to the unactuated position. The closure release button assembly 518 may also be configured to interact with various sensors that communicate with a microcontroller 520 in the handle assembly 500 for tracking the position of the closure trigger 512. Further details concerning the configuration and operation of the closure release button assembly 518 may be found in U.S. Pat. No. 9,913,642.

In at least one form, the handle assembly 500 and the frame 506 may operably support another drive system referred to herein as a firing drive system 530 that is configured to apply firing motions to corresponding portions of the interchangeable surgical tool assembly that is attached thereto. As was described in detail in U.S. Pat. No. 9,913,642, the firing drive system 530 may employ an electric motor 505 that is located in the pistol grip portion 504 of the handle assembly 500. In various forms, the motor 505 may be a DC brushed driving motor having a maximum rotation of, approximately, 25,000 RPM, for example. In other arrangements, the motor 505 may include a brushless motor, a cordless motor, a synchronous motor, a stepper motor, or any other suitable electric motor. The motor 505 may be powered by a power source 522 that in one form may comprise a removable power pack. The power pack may support a plurality of Lithium Ion (“LI”) or other suitable batteries therein. A number of batteries may be connected in series and may be used as the power source 522 for the handle assembly 500. In addition, the power source 522 may be replaceable and/or rechargeable.

The electric motor 505 is configured to axially drive a longitudinally movable drive member 540 in distal and proximal directions depending upon the polarity of the motor. For example, when the motor 505 is driven in one rotary direction, the longitudinally movable drive member 540 will be axially driven in the distal direction “DD”. When the motor 505 is driven in the opposite rotary direction, the longitudinally movable drive member 540 will be axially driven in a proximal direction “PD”. The handle assembly 500 can include a switch 513 which can be configured to reverse the polarity applied to the electric motor 505 by the power source 522 or otherwise control the motor 505. The handle assembly 500 can also include a sensor or sensors (not shown) that is configured to detect the position of the drive member 540 and/or the direction in which the drive member 540 is being moved. Actuation of the motor 505 can be controlled by a firing trigger 532 that is pivotally supported on the handle assembly 500. The firing trigger 532 may be pivoted between an unactuated position and an actuated position. The firing trigger 532 may be biased into the unactuated position by a spring (not shown) or other biasing arrangement such that when the clinician releases the firing trigger 532, it may be pivoted or otherwise returned to the unactuated position by the spring or biasing arrangement. In at least one form, the firing trigger 532 can be positioned “outboard” of the closure trigger 512 as was discussed above. As discussed in U.S. Pat. No. 9,913,642, the handle assembly 500 may be equipped with a firing trigger safety button (not shown) to prevent inadvertent actuation of the firing trigger 532. When the closure trigger 512 is in the unactuated position, the safety button is contained in the handle assembly 500 where the clinician cannot readily access it and move it between a safety position preventing actuation of the firing trigger 532 and a firing position wherein the firing trigger 532 may be fired. As the clinician depresses the closure trigger 512, the safety button and the firing trigger 532 may pivot down wherein they can then be manipulated by the clinician.

In at least one form, the longitudinally movable drive member 540 may have a rack of teeth (not shown) formed thereon for meshing engagement with a corresponding drive gear arrangement (not shown) that interfaces with the motor 505. Further details regarding those features may be found in U.S. Pat. No. 9,913,642. At least one form also includes a manually-actuatable “bailout” assembly that is configured to enable the clinician to manually retract the longitudinally movable drive member 540 should the motor 505 become disabled. The bailout assembly may include a lever or bailout handle assembly that is stored within the handle assembly 500 under a releasable door 550. The lever is configured to be manually pivoted into ratcheting engagement with the teeth in the drive member 540. Thus, the clinician can manually retract the drive member 540 by using the bailout handle assembly to ratchet the drive member 540 in the proximal direction “PD”. U.S. patent application Ser. No. 12/249,117, entitled POWERED SURGICAL CUTTING AND STAPLING APPARATUS WITH MANUALLY RETRACTABLE FIRING SYSTEM, now U.S. Pat. No. 8,608,045, the entire disclosure of which is hereby incorporated by reference herein, discloses bailout arrangements and other components, arrangements and systems that may also be employed with the tool assembly 1000.

Turning now to FIGS. 4, 5 and 6 , the interchangeable surgical tool assembly 1000 includes a shaft mounting portion 1300 that is operably attached to an elongate shaft assembly 1400. A surgical end effector 1100 that comprises an elongate channel 1102 that is configured to operably support a staple cartridge 1110 therein is operably attached to the elongate shaft assembly 1400. See FIGS. 3 and 4 . The end effector 1100 may further include an anvil 1130 that is pivotally supported relative to the elongate channel 1102. The elongate channel 1102 staple cartridge assembly 1110 and the anvil 1130 may also be referred to as “jaws”. The interchangeable surgical tool assembly 1000 may further include an articulation joint 1200 and an articulation lock 1210 (FIGS. 3 and 4 ) which can be configured to releasably hold the end effector 1100 in a desired articulated position about an articulation axis B-B which is transverse to a shaft axis SA. Details regarding the construction and operation of the articulation lock 1210 may be found in U.S. patent application Ser. No. 13/803,086, entitled ARTICULATABLE SURGICAL INSTRUMENT COMPRISING AN ARTICULATION LOCK, now U.S. Patent Application Publication No. 2014/0263541, the entire disclosure of which is hereby incorporated by reference herein. Additional details concerning the articulation lock 1210 may also be found in U.S. patent application Ser. No. 15/019,196, filed Feb. 9, 2016, entitled SURGICAL INSTRUMENT ARTICULATION MECHANISM WITH SLOTTED SECONDARY CONSTRAINT, the entire disclosure of which is hereby incorporated by reference herein.

As can be seen in FIGS. 5 and 6 , the shaft mounting portion 1300 includes a proximal housing or nozzle 1301 comprised of nozzle portions 1302, 1304 as well as an actuator wheel portion 1306 that is configured to be coupled to the assembled nozzle portions 1302, 1304 by snaps, lugs, screws etc. In the illustrated embodiment, the interchangeable surgical tool assembly 1000 further includes a closure assembly 1406 which can be utilized to close and/or open the anvil 1130 and the elongate channel 1102 of the end effector 1100 as will be discussed in further detail below. In addition, the illustrated interchangeable surgical tool assembly 1000 includes a spine assembly 1500 which is operably supports the articulation lock 1210. The spine assembly 1500 is configured to, one, slidably support a firing member assembly 1600 therein and, two, slidably support the closure assembly 1406 which extends around the spine assembly 1500 or is otherwise movably supported thereby.

In the illustrated arrangement, the surgical end effector 1100 is operably coupled to the elongate shaft assembly 1400 by an articulation joint 1200 that facilitates selective articulation of the surgical end effector 1100 about an articulation axis B-B that is transverse to the shaft axis SA. See FIG. 3 . As can be seen in FIG. 4 , the spine assembly 1500 slidably supports a proximal articulation driver 1700 that operably interfaces with an articulation lock 1210. The articulation lock 1210 is supported on a distal frame segment 1560 that also comprises a portion of the spine assembly 1500. As can be seen in FIG. 4 , the distal frame segment 1560 is pivotally coupled to the elongate channel 1102 by an end effector mounting assembly 1230. In one arrangement, for example, a distal end 1562 of the distal frame segment 1560 has an articulation pin 1564 formed thereon. The articulation pin 1564 is adapted to be pivotally received within an articulation pivot hole 1234 formed in a pivot base portion 1232 of the end effector mounting assembly 1230. The end effector mounting assembly 1230 is pivotally attached to a proximal end 1103 of the elongate channel 1102 by a pair of laterally extending jaw attachment pins 1235 that are rotatably received within jaw pivot holes 1104 that are provided in the proximal end 1103 of the elongate channel 1102. The jaw attachment pins 1235 define a jaw pivot axis JA that is substantially traverse to the shaft axis SA. See FIG. 3 . The articulation pivot pin 1564 defines an articulation axis B-B that is transverse to the shaft axis SA. Such arrangement facilitates pivotal travel (i.e., articulation) of the end effector 1100 about the articulation axis B-B relative to the spine assembly 1500.

Referring again to FIG. 4 , in the illustrated embodiment, the articulation driver 1700 has a distal end 1702 that is configured to operably engage the articulation lock 1210. The articulation lock 1210 includes an articulation frame 1212 that is pivotally coupled to an articulation link 1214 that is adapted to operably engage an articulation drive pin 1236 on the pivot base portion 1232 of the end effector mounting assembly 1230. As indicated above, further details regarding the operation of the articulation lock 1210 and the articulation frame 1212 may be found in U.S. patent application Ser. No. 13/803,086, U.S. Patent Application Publication No. 2014/0263541. Further details regarding the end effector mounting assembly and articulation link 1214 may be found in U.S. patent application Ser. No. 15/019,245, filed Feb. 9, 2016, entitled SURGICAL INSTRUMENTS WITH CLOSURE STROKE REDUCTION ARRANGEMENTS, the entire disclosure of which is hereby incorporated by reference herein.

In various circumstances, the spine assembly 1500 further includes a proximal spine channel 1510 that may be fabricated out of pressed, bent or machined material. As can be seen in FIG. 6 , the proximal spine channel 1510 is essentially C-shaped (when viewed from a distal end) and is configured to operably support the firing member assembly 1600 between side wall portions 1512 thereof. As can be seen in FIGS. 6 and 7 , the spine assembly 1500 further comprises a proximal spine mounting segment 1530 that is rotatably pinned to a distal end 1514 of the proximal spine channel 1510 by a spine pin 1550. The proximal spine mounting segment 1530 comprises a proximal end portion 1532 that has opposing notches 1535 (only one can be seen in FIG. 7 ) for receiving a corresponding mounting lug 1308 (shown in FIG. 5 ) that protrude inwardly from each of the nozzle portions 1302, 1304. Such arrangement facilitates rotation of the proximal spine mounting segment 1530 about the shaft axis SA by rotating the nozzle 1301 about the shaft axis SA. In the illustrated arrangement, the proximal spine mounting segment 1530 further comprises a distally protruding lower shaft segment 1534 and a distally protruding upper shaft segment 1536 that is spaced from the lower shaft segment 1534. See FIG. 7 . Each of the shaft segments 1534, 1536 has an arcuate cross-sectional shape. The lower shaft segment 1534 is received within the proximal end 1514 of the proximal spine channel 1510. The spine pin 1550 extends through a pivot hole 1516 in the proximal end of the proximal spine channel 1510 and a pivot hole 1538 in the lower shaft segment 1534. The spine pin 1550 includes a vertical groove 1552 that forms two upstanding sidewall portions 1554. The upper ends of the side wall portions 1554 are received within corresponding pockets 1539 that are formed in the proximal spine mounting segment 1530.

The interchangeable surgical tool assembly 1000 includes a chassis 1800 that rotatably supported the shaft assembly 1400. The proximal end portion 1532 of the proximal spine mounting segment is rotatably supported in a central shaft hole 1801 that is formed in the chassis 1800. See FIG. 6 . In one arrangement, for example, the proximal end portion 1532 may be threaded for attachment to a spine bearing (not shown) or other wise supported in a spine bearing that is mounted within the chassis 1800. Such an arrangement facilitates rotatable attachment of the spine assembly 1500 to the chassis 1800 such that the spine assembly 1500 may be selectively rotated about a shaft axis SA relative to the chassis 1800.

The closure assembly 1406 comprises an elongate intermediate closure member 1410, a distal closure member 1430 and a proximal closure member 1480. In the illustrated arrangement, the proximal closure member 1480 comprises a hollow tubular member that is slidably supported on a portion of the spine assembly 1500. Hence, the proximal closure member 1480 may also be referred to herein as the proximal closure tube. Similarly, the intermediate closure member 1410 may also be referred to herein as the intermediate closure tube and the distal closure member 1430 may also be referred to as the distal closure tube. Referring primarily to FIG. 6 , the interchangeable surgical tool assembly 1000 includes a closure shuttle 1420 that is slidably supported within the chassis 1800 such that it may be axially moved relative thereto. In one form, the closure shuttle 1420 includes a pair of proximally-protruding hooks 1421 that are configured for attachment to the attachment pin 516 (FIG. 2 ) that is attached to the closure linkage assembly 514 of the handle assembly 500. Thus, when the hooks 1421 are hooked over the pin 516, actuation of the closure trigger 512 will result in the axial movement of the closure shuttle 1420 and ultimately, the closure assembly 1406 on the spine assembly 1500. A closure spring (not shown) may also be journaled on the closure assembly 1406 and serves to bias the closure member assembly 1406 in the proximal direction “PD” which can serve to pivot the closure trigger 512 into the unactuated position when the tool assembly 1000 is operably coupled to the handle assembly 500. In use, the closure member assembly 1406 is translated distally (direction DD) to close the anvil 1130, for example, in response to the actuation of the closure trigger 512.

The closure linkage 514 may also be referred to herein as a “closure actuator” and the closure linkage 514 and the closure shuttle 1420 may be collectively referred to herein as a “closure actuator assembly”. A proximal end 1482 of the proximal closure member 1480 is coupled to the closure shuttle 1420 for relative rotation thereto. For example, a U-shaped connector 1485 is inserted into an annular slot 1484 in the proximal end 1482 of the proximal closure member 1480 and is retained within vertical slots 1422 in the closure shuttle 1420. See FIG. 6 . Such arrangement serves to attach the proximal closure member 1480 to the closure shuttle 1420 for axial travel therewith while enabling the closure assembly 1406 to rotate relative to the closure shuttle 1420 about the shaft axis SA.

As indicated above, the illustrated interchangeable surgical tool assembly 1000 includes an articulation joint 1200. As can be seen in FIG. 4 , upper and lower tangs 1415, 1416 protrude distally from a distal end of the intermediate closure member 1410 to be movably coupled to the distal closure member 1430. As can be seen in FIG. 4 , the distal closure member 1430 includes upper and lower tangs 1434, 1436 that protrude proximally from a proximal end thereof. The intermediate closure member 1410 and the distal closure member 1430 are coupled together by an upper double pivot link 1220. The upper double pivot link 1220 includes proximal and distal pins that engage corresponding holes in the upper tangs 1415, 1434 of the proximal closure member 1410 and distal closure member 1430, respectively. The intermediate closure member 1410 and the distal closure member 1430 are also coupled together by a lower double pivot link 1222. The lower double pivot link 1222 includes proximal and distal pins that engage corresponding holes in the lower tangs 1416 and 1436 of the intermediate closure member 1410 and distal closure member 1430, respectively. As will be discussed in further detail below, distal and proximal axial translation of the closure assembly 1406 will result in the closing and opening of the anvil 1130 and the elongate channel 1102.

As mentioned above, the interchangeable surgical tool assembly 1000 further includes a firing member assembly 1600 that is supported for axial travel within the spine assembly 1500. In the illustrated embodiment, the firing member assembly 1600 includes a proximal firing shaft segment 1602, an intermediate firing shaft segment 1610 and a distal cutting portion or distal firing bar 1620. The firing member assembly 1600 may also be referred to herein as a “second shaft” and/or a “second shaft assembly”. As can be seen in FIG. 6 , the proximal firing shaft segment 1602 may be formed with a distal mounting lug 1604 that is configured to be received with a corresponding cradle or groove 1613 in the proximal end 1612 of the intermediate firing shaft segment 1610. A proximal attachment lug 1606 is protrudes proximally from a proximal end of the proximal firing shaft segment 1602 and is configured to be operably received within the firing shaft attachment cradle 542 in the longitudinally movable drive member 540 that is supported in the handle assembly 500. See FIG. 2 .

Referring again to FIG. 6 , a distal end 1616 of the intermediate firing shaft segment 1610 includes a longitudinal slot 1618 which is configured to receive a tab (not shown) on the proximal end of the distal firing bar 1620. The longitudinal slot 1618 and the proximal end of the distal firing bar 1620 can be sized and configured to permit relative movement therebetween and can comprise a slip joint 1622. The slip joint 1622 can permit the proximal firing shaft segment 1602 and the intermediate firing shaft segment 1610 of the firing member assembly 1600 to move as a unit during the articulation action without moving, or at least substantially moving, the distal firing bar 1620. Once the end effector 1100 has been suitably oriented, the proximal firing shaft segment 1602 and the intermediate firing shaft segment 1610 can be advanced distally until a proximal end wall of the longitudinal slot 1618 comes into contact with the tab on the distal firing bar 1620 to advance the distal firing bar 1620 and fire the staple cartridge 1110 that is positioned within the elongate channel 1102. As can be further seen in FIG. 6 , to facilitate assembly, the proximal firing shaft segment 1602, the intermediate firing shaft segment 1610 and the distal firing bar 1620 may be inserted as a unit into the proximal spine channel 1510 and a top spine cover 1527 may be engaged with the proximal spine channel 1510 to enclose those portions of the firing member assembly 1600 therein.

Further to the above, the interchangeable surgical tool assembly 1000 includes a clutch assembly 1640 which can be configured to selectively and releasably couple the articulation driver 1700 to the firing member assembly 1600. In one form, the clutch assembly 1640 includes a rotary lock assembly that in at least one embodiment comprises a lock collar, or lock sleeve 1650 that is positioned around the firing member assembly 1600. The lock sleeve 1650 is configured to be rotated between an engaged position in which the lock sleeve 1650 couples the articulation driver 1700 to the firing member assembly 1600 and a disengaged position in which the articulation driver 1700 is not operably coupled to the firing member assembly 1600. When lock sleeve 1650 is in its engaged position, distal movement of the firing member assembly 1600 can move the articulation driver 1700 distally and, correspondingly, proximal movement of the firing member assembly 1600 can move the articulation driver 1700 proximally. When lock sleeve 1650 is in its disengaged position, movement of the firing member assembly 1600 is not transmitted to the articulation driver 1700 and, as a result, the firing member assembly 1600 can move independently of the articulation driver 1700. In various circumstances, the articulation driver 1700 can be held in position by the articulation lock 1210 when the articulation driver 1700 is not being moved in the proximal or distal directions by the firing member assembly 1600.

Referring primarily to FIGS. 8 and 9 , the lock sleeve 1650 comprises a cylindrical, or an at least substantially cylindrical, body including a longitudinal aperture 1652 defined therein configured to receive the proximal firing shaft segment 1602 of the firing member assembly 1600. The lock sleeve 1650 also has two diametrically-opposed, inwardly-facing lock protrusions 1654 formed thereon. Only one lock protrusion 1654 can be seen in FIGS. 8 and 9 . The lock protrusions 1654 can be configured to be selectively engaged with the proximal firing shaft segment 1602 of the firing member assembly 1600. More particularly, when the lock sleeve 1650 is in its engaged position (FIG. 8 ), the lock protrusions 1654 are positioned within a drive notch 1603 that is provided in the proximal firing shaft segment 1602 such that a distal pushing force and/or a proximal pulling force can be transmitted from the firing member assembly 1600 to the lock sleeve 1650. As can be seen in FIGS. 8 and 9 , an articulation drive notch 1655 is provided in a distal end portion of the lock sleeve 1650 for attachment to a proximal end 1704 of the proximal articulation driver 1700. In the illustrated arrangement, for example, the proximal end 1704 includes a driver notch 1706 that is configured to engage the drive notch 1655 in the lock sleeve 1650. Such attachment arrangement enables the lock sleeve 1650 to be rotated relative to the proximal articulation driver 1700 while remaining attached thereto. When the lock sleeve 1650 is in an “articulation mode” or orientation (FIG. 8 ), a distal pushing force and/or a proximal pulling force that is applied to the proximal firing shaft segment 1602 is also transmitted to the lock sleeve 1650 and the proximal articulation driver 1700 that is coupled thereto. In effect, the firing member assembly 1600, the lock sleeve 1650, and the proximal articulation driver 1700 will move together when the lock sleeve 1650 is in the articulation mode. On the other hand, when the lock sleeve 1650 is in its “firing mode” (FIG. 9 ), the lock protrusions 1654 are not positioned within the drive notch 1603 in the proximal firing shaft segment 1602 of the firing member assembly 1600. When in that position, a distal pushing force and/or a proximal pulling force applied to the proximal firing shaft segment 1602 is not transmitted to the lock sleeve 1650 and the proximal articulation driver 1700. In such circumstances, the firing member assembly 1600 can move proximally and/or distally relative to the lock sleeve 1650 and the proximal articulation driver 1700.

The illustrated clutch assembly 1640 further includes a switch drum 1660 that interfaces with the lock sleeve 1650. The switch drum 1660 comprises a hollow shaft segment that operably interfaces with a shift plate assembly 1680 that is supported therein. The shift plate assembly 1680 comprises a body portion 1681 that has a shift pin 1682 that protrudes laterally therefrom. The shift pin 1682 extends into a shift pin slot 1662 that is provided through a wall portion of the shift drum 1660. The body portion 1681 of the shift plate assembly 1680 has a slide slot 1683 formed therein that is sized and configured to interface with a slide boss 1656 that protrudes from a proximal end of the slide lock 1650. The switch drum 1660 can further include openings 1664 which permit the inwardly extending mounting lugs 1308 that extend from the nozzle halves 1302, 1304 to extend therethrough to be seating received within the corresponding notches 1535 in the proximal spine mounting segment 1530. See FIG. 5 . Such arrangement facilitates rotation of the shaft assembly 1400 about the shaft axis SA by rotating the nozzle 1301.

Also in the illustrated embodiment, the switch drum 1660 includes a magnet support arm 1665 that supports an articulation magnet 1708 and a firing magnet 1611 therein. The articulation magnet 1708 and firing magnet 1611 are configured to operably interface with a Hall effect sensor 1632 that interfaces with a slip ring assembly 1630 that is operably mounted to the chassis 1800. The slip ring assembly 1630 is configured to conduct electrical power to and/or from the interchangeable surgical shaft assembly 1000 and/or communicate signals to and/or from the interchangeable shaft assembly 1000 components back to the microcontroller 520 in the handle assembly 500 (FIG. 2 ) or robotic system controller, for example. Further details concerning the slip ring assembly 1630 and associated connectors may be found in U.S. patent application Ser. No. 13/803,086 and U.S. patent application Ser. No. 15/019,196 which have each been herein incorporated by reference in their respective entirety as well as in U.S. patent application Ser. No. 13/800,067, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, now U.S. Patent Application Publication No. 2014/0263552, which is hereby incorporated by reference herein in its entirety. The articulation magnet 1708 and the firing magnet 1611 cooperate with the Hall effect sensor 1632 or other sensor arrangement to detect the rotary position of the switch drum 1660 and convey that information to the microcontroller 520 which may serve to provide an indication or indications to the user in the various manners discussed in the aforementioned incorporated references. Other sensor arrangements may also be employed.

In various circumstances, the handle assembly 500 may be used to control a variety of different interchangeable surgical tool assemblies that are configured to perform various surgical procedures. As briefly mentioned above, the interchangeable surgical tool assembly 1000 may also be effectively used in connection with robotic systems and automated surgical systems that each may be referred to herein as “control systems” or “control units”. Such control systems or control units may operably support firing systems and closure systems that are configured upon actuation to move a firing actuation component or “firing actuator” (in the case of the firing system) and a closure actuation component or “closure actuator” (in the case of the closure system) a corresponding axial distance to apply control motions to corresponding components within the interchangeable tool assembly. In one arrangement, when a closure system in the handle assembly (or robotic system) is fully actuated, a closure actuator may move axially from an unactuated position to its fully actuated position. The axial distance that the closure component moves between its unactuated position to its fully actuated position may be referred to herein as its “closure stroke length” or a “first closure distance”. Similarly, when a firing system in the handle assembly or robotic system is fully actuated, one of the firing system components may move axially from its unactuated position to its fully actuated or fired position. The axial distance that the firing member component moves between its unactuated position and its fully fired position may be referred to herein as its “firing stroke length” or “first firing distance”. For those surgical tool assemblies that employ articulatable end effector arrangements, the handle assembly or robotic system may employ articulation control components that move axially through an “articulation drive stroke length” or a “first articulation distance”. In many circumstances, the closure stroke length, the firing stroke length and the articulation drive stroke length are fixed for a particular handle assembly or robotic system. Thus, each of the interchangeable surgical tool assemblies that are configured to be used in connection with such control units or systems must be able to accommodate control movements of the closure, firing and/or articulation components/actuators through each of their entire stroke lengths without placing undue stress on the surgical tool components which might lead to damage or catastrophic failure of surgical tool assembly. Examples of surgical tool assemblies that have arrangements for reducing the axial closure stroke of an actuator system are disclosed in U.S. patent application Ser. No. 15/019,245, filed Feb. 9, 2016, entitled SURGICAL INSTRUMENTS WITH CLOSURE STROKE REDUCTION ARRANGEMENTS, the entire disclosure of which is hereby incorporated by reference herein. U.S. patent application Ser. No. 14/574,478, entitled SURGICAL INSTRUMENT SYSTEMS COMPRISING AN ARTICULATABLE END EFFECTOR AND MEANS FOR ADJUSTING THE FIRING STROKE OF A FIRING MEMBER discloses arrangements for adjusting the firing stroke of a firing member.

Depending upon the jaw arrangement of the end effector portion of the interchangeable surgical tool assembly that is operably coupled to the handle assembly 500, the closure drive system 510 in the handle assembly 500, when fully actuated, may generate a closure stroke or first axial closure distance that is too long for such a jaw arrangement. The illustrated embodiment of the interchangeable surgical tool assembly 1000 employs a closure stroke reduction assembly generally designated as 1720 to reduce the amount of closure stroke that is applied to the end effector when the closure drive system 510 is fully actuated. For example, the closure drive system 510 in one form of the handle assembly 500 may generate axial closure motions so as to move the closure actuator (e.g., the closure linkage 514—FIG. 2 ) or closure actuator assembly (e.g., the closure linkage 514, and the closure shuttle 1420) axially forward and backward about 0.240″-0.260″. Such axial control travel may be well-suited for surgical end effectors that are equipped with an anvil or jaw arrangement that moves distally relative to the channel or jaw arrangements to which they are attached. Because the jaws are pivotally coupled together about a fixed jaw axis JA, they may be better suited for a shorter closure stroke. Stated another way, the anvil 1130 does not move distally relative to the elongate channel 1102. For example, such arrangement may be better suited for a closure stroke range of approximately 0.1″-0.150″. As will be discussed in further detail below, upon full actuation of the closure drive system 510 in the handle assembly 500, the closure shuttle 1420 and the proximal closure member 1480 may move approximately the 0.260″ in the distal direction DD (“first closure stroke distance”). However, the closure stroke reduction assembly 1720 reduces the amount of closure stroke that is applied to the intermediate closure member 1410 and ultimately to the distal closure member 1430 (“second closure stroke distance”). In some arrangements, for example, the closure stroke reduction assembly 1720 may reduce the magnitude of the closure stroke that is applied to the intermediate closure member 1410 and distal closure member 1430 to approximately 0.1″, for example. It will be appreciated that other amounts of closure stroke reduction could conceivably be achieved.

Referring now to FIGS. 12A and 12B, in one form, the closure stroke reduction assembly 1720 includes a closure reduction linkage 1730 that is attached to a closure member mounting member or mounting ring 1740. As can be seen in FIGS. 6, 12A and 12B, the intermediate closure member 1410 has a proximal attachment flange 1414 that is formed on a proximal end portion 1412. The mounting ring 1740 is sized to slidably move within the proximal closure member 1480 and includes a mounting groove 1742 for receiving the attachment flange 1414 therein. Such arrangement serves to attach the mounting ring 1740 to the intermediate closure member 1410. In the illustrated embodiment, the closure reduction linkage 1730 comprises a proximal link 1732 and a distal link 1734 that are pivotally attached together by an actuator pin 1736. The proximal link 1732 is pivotally pinned to an upstanding attachment wall 1518 that is formed on the proximal spine channel 1510. The distal link 1734 is pivotally pinned to the mounting ring 1740. The closure reduction linkage 1730 is actuated by axially moving the proximal closure member 1480. In at least one arrangement, for example, the actuator pin 1736 is slidably journaled in a cam slot 1486 that is provided in the proximal closure member 1480. The actuator pin 1736 also extends inwardly to be slidably received within a slide track 1658 that is formed on a proximal end portion of the lock sleeve 1650. Thus, when the proximal closure member 1480 is moved to its distal-most position, the actuator pin 1736 is in the proximal end of the cam slot 1486 such that the closure reduction linkage 1730 is in its fully extended position as shown in FIGS. 12B and 14 . When the proximal closure member 1480 is in its proximal-most position, the closure reduction linkage 1730 is in its retracted position (FIGS. 12A and 13 ).

As was briefly discussed above, the shift plate assembly 1680 comprises a body portion 1681 that has a shift pin 1682 that laterally protrudes therefrom. The shift pin 1682 extends into a shift pin slot 1662 that is provided through a wall portion of the switch drum 1660. The shift pin 1682 also extends through a cam opening 1490 that is provided in the proximal closure member 1480. See FIGS. 10 and 11 . The cam opening 1490 in the illustrated arrangement includes a travel portion 1492 that is sufficiently long enough so as to permit a predetermined amount of axial travel of the proximal closure member assembly 1480 relative to the shift pin 1682 and a firing portion 1494. In at least one arrangement, the shift plate 1680 is constrained to only rotate a short distance around the shaft axis SA and is constrained not to move axially within the switch drum 1660. This rotary travel of the shift plate 1680 and the shift pin 1682 may be observed from reference to FIGS. 8-11 .

FIGS. 8, 10 and 12A illustrate the clutch assembly 1640 in the articulation mode and FIGS. 9, 11 and 12B, illustrate the clutch assembly 1640 in the firing mode. The clutch assembly 1640 is moved from the articulation mode to the firing mode by moving the proximal closure member 1480 to it distal-most position which corresponds to a “fully closed” position of the end effector jaws (elongate channel 1102 and anvil 1130). The proximal closure member 1480 is moved distally by depressing the closure trigger 512 on the handle assembly 500. As discussed above, when the closure trigger 512 is depressed, the closure shuttle 1420 is advanced distally. Because the proximal closure member 1480 is supported in the closure shuttle 1420, the proximal closure member 1480 moves distally as well. When the clutch assembly 1640 is in the articulation mode, the shift pin 1682 is located about midway (lengthwise) within the travel portion 1492 of the cam opening 1490 in the proximal closure member 1480. Thus, the proximal closure member 1480 can be moved back and forth axially (by means of depressing and at least partially releasing the closure trigger 512) a short distance to effectively move the jaws (anvil 1130 and elongate channel 1102) between open and closed positions without moving the clutch assembly 1640 into the firing mode. Thus, the clinician can use the jaws to grasp and manipulate tissue without moving the jaws to a fully closed position and without shifting the clutch assembly 1640 to the firing mode. However, when the clinician desires to fully close the jaws, the clinician fully depresses the closure trigger 512 to the fully actuated position. This action causes the proximal closure member 1480 to move to its distal-most axial position. See FIGS. 9, 11 and 12B. When the proximal closure member 1480 moves to this position, the proximal cam wall 1491 of the cam opening 1490 contacts the shift pin 1682 and cams the shift pin 1682 (and the shift plate 1680) to the firing orientation shown in FIGS. 9 and 11 . In the illustrated embodiment, a torsional shift spring 1667 is journaled on the switch drum 1660 and is configured to bias the switch drum 1660 into the position corresponding to the articulation mode. See FIG. 10 . The shift pin 1682 is in the bottom of the shift pin slot 1662 in the switch drum 1660 and is thereby moved to the articulation position shown in FIG. 10 . To apply the torsional biasing force to the switch drum 1660, one end 1668 of the torsion spring 1667 is attached to the switch drum 1660 and the other end 1669 is attached to nozzle 1301. Further details concerning the operation of the clutch assembly 1640 and the closure stroke reduction assembly 1720 are provided below.

FIG. 12A illustrates the positions of the closure stroke reduction assembly 1730 and the intermediate closure member 1410 when the proximal closure member 1480 is in an unactuated position. This “unactuated” position may correspond to the orientations of the jaws of the surgical end effector when the jaws are in their respective “fully opened” positions. For reference purposes, the unactuated position of the proximal closure member 1480 is represented by a starting witness line SWL_(p) and the unactuated position of the intermediate closure member 1410 is represented by starting witness line SWL_(i). FIG. 12B illustrates the positions of the of the closure stroke reduction assembly 1730 and the intermediate closure member 1410 when the proximal closure member 1480 is in a fully actuated position which may correspond to the orientations of the jaws of the surgical end effector when the jaws are in their respective “fully closed” positions. As was briefly discussed above, when the proximal closure member 1480 is in the fully actuated position, actuation of the firing trigger 532 will cause the firing member assembly 1600 to be advanced distally. For reference purposes, the fully actuated position of the proximal closure segment 1480 is represented by an ending witness line EWL_(p). The fully actuated position of the intermediate closure member 1410 is represented by a ending witness line EWL_(i). The axial distance that the proximal closure member 1480 traveled between the unactuated position and the fully actuated position is represented by distance D₁. In one example, D₁ may be approximately 0.260″. The axial distance that the intermediate closure member 1410 (and ultimately the distal closure member 1430) traveled between the unactuated position and the fully actuated position is represented by distance D₂. As can be seen in FIGS. 12A and 12B, D₁>D₂. In the above-referenced example, D₂ may be approximately 0.1″. Thus, the intermediate closure member 1410 and the distal closure member 1430 traveled a shorter axial distance than did the proximal closure member 1480. Such arrangement permits the jaw arrangements of the surgical end effector 1100 to better utilize the closure motions generated by the closure drive system 510 in the handle assembly 500 and avoid potential damage that might otherwise result if the full range of closure motions were applied to the end effector.

Referring again to FIGS. 2 and 6 , the chassis 1800 includes at least one, and preferably two, tapered attachment portions 1802 that are formed thereon and are adapted to be received within corresponding dovetail slots 507 that are formed within the distal end portion of the frame 506 of the handle assembly 500. As can be further seen in FIG. 2 , a shaft attachment lug 1606 is formed on the proximal end of the proximal firing shaft segment 1602. As will be discussed in further detail below, when the interchangeable surgical tool assembly 1000 is coupled to the handle assembly 500, the shaft attachment lug 1606 is received in a firing shaft attachment cradle 542 that is formed in the distal end of the longitudinal drive member 540. See FIG. 2 .

The interchangeable surgical tool assembly 1000 employs a latch system 1810 for removably coupling the interchangeable surgical tool assembly 1000 to the frame 506 of the handle assembly 500. As can be seen in FIG. 5 , for example, in at least one form, the latch system 1810 includes a lock member or lock yoke 1812 that is movably coupled to the chassis 1800. In the illustrated embodiment, for example, the lock yoke 1812 has a U-shape and includes two downwardly extending legs 1814. The legs 1814 each have a pivot lug (not shown) formed thereon that is adapted to be received in corresponding holes 1816 that are formed in the chassis 1800. Such arrangement facilitates pivotal attachment of the lock yoke 1812 to the chassis 1800. See FIG. 6 . The lock yoke 1812 may include two proximally protruding lock lugs 1818 that are configured for releasable engagement with corresponding lock detents or grooves 509 in the distal end of the frame 506 of the handle assembly 500. See FIG. 2 . In various forms, the lock yoke 1812 is biased in the proximal direction by a spring or biasing member 1819. Actuation of the lock yoke 1812 may be accomplished by a latch button 1820 that is slidably mounted on a latch actuator assembly 1822 that is mounted to the chassis 1800. The latch button 1820 may be biased in a proximal direction relative to the lock yoke 1812. The lock yoke 1812 may be moved to an unlocked position by biasing the latch button 1820 the in distal direction which also causes the lock yoke 1812 to pivot out of retaining engagement with the distal end of the frame 506. When the lock yoke 1812 is in “retaining engagement” with the distal end of the frame 506, the lock lugs 1818 are retainingly seated within the corresponding lock detents or grooves 509 in the distal end of the frame 506.

In the illustrated arrangement, the lock yoke 1812 includes at least one and preferably two lock hooks 1824 that are adapted to contact corresponding lock lug portions 1426 that are formed on the closure shuttle 1420. When the closure shuttle 1420 is in an unactuated position, the lock yoke 1812 may be pivoted in a distal direction to unlock the interchangeable surgical tool assembly 1000 from the handle assembly 500. When in that position, the lock hooks 1824 do not contact the lock lug portions 1426 on the closure shuttle 1420. However, when the closure shuttle 1420 is moved to an actuated position, the lock yoke 1812 is prevented from being pivoted to an unlocked position. Stated another way, if the clinician were to attempt to pivot the lock yoke 1812 to an unlocked position or, for example, the lock yoke 1812 was in advertently bumped or contacted in a manner that might otherwise cause it to pivot distally, the lock hooks 1824 on the lock yoke 1812 will contact the lock lugs 1426 on the closure shuttle 1420 and prevent movement of the lock yoke 1812 to an unlocked position. See FIG. 5 . Further details concerning the latching system may be found in U.S. Patent Application Publication No. 2014/0263541.

Attachment of the interchangeable surgical tool assembly 1000 to the handle assembly 500 will now be described with reference to FIG. 2 . To commence the coupling process, the clinician may position the chassis 1800 of the interchangeable surgical tool assembly 1000 above or adjacent to the distal end of the frame 506 such that the tapered attachment portions 1802 formed on the chassis 1800 are aligned with the dovetail slots 507 in the frame 506. The clinician may then move the surgical tool assembly 1000 along an installation axis IA that is perpendicular to the shaft axis SA to seat the tapered attachment portions 1802 in “operable engagement” with the corresponding dovetail receiving slots 507 in the distal end of the frame 506. In doing so, the shaft attachment lug 1606 on the proximal firing shaft segment 1602 will also be seated in the cradle 542 in the longitudinally movable drive member 540 and the portions of pin 516 on the closure link 514 will be seated in the corresponding hooks 1421 in the closure shuttle 1420. As used herein, the term “operable engagement” in the context of two components means that the two components are sufficiently engaged with each other so that upon application of an actuation motion thereto, the components may carry out their intended action, function and/or procedure.

Referring again to FIG. 4 , the distal firing bar 1620 may comprise a laminated beam structure that includes at least two beam layers. Such beam layers may comprise, for example, stainless steel bands that are interconnected by, for example, welding or pinning together at their proximal ends and/or at other locations along their length. In alternative embodiments, the distal ends of the bands are not connected together to allow the laminates or bands to splay relative to each other when the end effector is articulated. Such arrangement permits the distal firing bar 1620 to be sufficiently flexible to accommodate articulation of the end effector. Various laminated knife bar arrangements are disclosed in U.S. patent application Ser. No. 15/019,245. As can also be seen in FIG. 4 , a middle support member 1614 is employed to provide lateral support to the distal firing bar 1620 as it flexes to accommodate articulation of the surgical end effector 1100. Further details concerning the middle support member and alternative knife bar support arrangements are disclosed in U.S. patent application Ser. No. 15/019,245.

After the interchangeable surgical tool assembly 1000 has been operably coupled to the handle assembly 500 (FIG. 1 ), the clinician may operate the surgical tool assembly 10 as follows. As discussed above, when the closure drive system 510 is in its unactuated position (i.e., the closure trigger 512 has not been actuated), the torsion spring 1667 has biased the clutch assembly 1640 and, more particularly, the switch pin 1682 and the lock sleeve 1650 into the articulation position. See FIGS. 8, 10 and 12A. As can be seen in FIG. 8 , when in that position, the lock protrusions 1654 in the lock sleeve 1650 are received within the drive notch 1603 in the proximal firing shaft segment 1602. As can be seen in FIG. 10 , when in that mode, the articulation magnet 1708 is in position relative to the Hall effect sensor 1632 so as to indicate to the microcontroller 520 that the tool assembly 1000 is in the articulation mode. When the clinician actuates the firing trigger 512, the motor drives the proximal firing shaft segment 1602 distally. As mentioned above, however, the slip joint 1622 facilitates movement of the proximal firing shaft segment 1602 and the intermediate firing shaft segment 1610 without moving, or at least substantially moving, the distal firing bar 1620. Because the lock sleeve 1650 is in operable engagement with the proximal firing shaft segment 1602 and the proximal articulation driver 1700 is in engagement with the lock sleeve 1650, actuation of the proximal firing shaft segment 1602 results in the distal movement of the articulation driver 1700. Distal movement of the articulation driver 1700 causes the surgical end effector 1000 to articulate around the articulation axis B-B. During this time, the clinician can also partially close the jaws of the end effector 1100 by partially depressing the closure trigger. Such axial movement of the proximal closure member 1480 without automatically shifting the clutch assembly 1640 to the firing mode is accommodated by the travel portion 1492 of the cam opening 1490 in the proximal closure member 1480. See FIG. 10 . This feature enables the clinician to use the jaws to grasp and manipulate tissue prior to clamping onto the target tissue.

Once the clinician has articulated the end effector 1100 into a desired position and the jaws have been positioned in a desired orientation relative to the target tissue, the clinician releases the firing trigger 532 which will discontinue the motorized movement of the proximal firing shaft segment 1602 as well as the proximal articulation driver 1700. The articulation lock 1210 will lock the proximal articulation driver 1700 in that position to prevent further articulation of the end effector 1100. The clinician may clamp the target tissue between the jaws by depressing the closure trigger 512 to the fully depressed position. Such action moves the proximal closure member 1480 distally. Such distal movement of the proximal closure member 1480 causes the switch pin 1682 to rotate downward within the cam opening 1490 as it is contacted by the cam wall 1491. See FIG. 11 . Referring now to FIG. 11 , movement of the shift pin 1682 downwardly within cam opening 1490 causes the shift plate 1680 to rotate the lock sleeve 1650 to rotate to a disengaged position with the proximal firing shaft segment 1602. When in that position, the lock protrusions 1654 have disengaged from the drive notch 1603 in the proximal firing shaft segment 1602. Thus, the proximal firing shaft segment 1602 can move axially without moving the lock sleeve 1650 and the proximal articulation driver 1700. As the proximal closure member 1480 is moved distally to the fully actuated position (by depressing the closure trigger 512), the closure stroke reduction assembly 1730 moves the intermediate closure member 1410 distally a reduced axial distance as was discussed above. This axial motion is applied to the distal closure member 1430 and ultimately moves the jaws to the fully closed position. When in this position, the closure drive system 510 system in the handle assembly 500 may be locked and the clinician can release the closure trigger 512. When the clutch assembly 1640 has been moved to this firing mode, the firing magnet 1611 is in communication with the Hall effect sensor 1632 to indicate the position of the clutch assembly 1640 to the microcontroller 520. See FIG. 11 . The microcontroller 520 may provide the clinician with an indication of the position of the distal firing bar 1620 as it is advanced distally through the target tissue that is clamped between the end effector jaws. Once the distal firing bar 1620 and, more specifically, the firing member or knife member attached thereto has been advanced to a fully fired position, the microcontroller 520, by means of sensor arrangements, detects the position of a portion of the firing member assembly 1600 and may then reverse the motor to retract the distal firing bar 1620 to its starting position. This action may be automatic or the clinician may have to depress the firing trigger 532 during the retraction process. Once the distal firing bar 1620 has been fully retracted to its starting position, the microcontroller 520 may provide the clinician with an indication that the distal firing bar 1620 has been fully retracted and the closure trigger 512 may be unlocked to enable the closure assembly 1406 to be returned to the unactuated position which thereby moves the jaws to the open position.

In the embodiment illustrated in FIGS. 15A and 15B, the anvil assembly 1130 includes an anvil body portion 1132 and an anvil mounting portion 1134. The anvil mounting portion 1134 comprises a pair of anvil mounting walls 1136 that are separated by a slot 1138 (FIG. 4 ). The anvil mounting walls 1136 are interconnected or bridged by an upstanding tab portion 1139. As discussed above, the end effector mounting assembly 1230 is pivotally attached to the proximal end 1103 of the elongate channel 1102 by a pair of laterally extending jaw attachment pins 1235 that are rotatably received within jaw pivot holes 1104 that are provided in the proximal end 1103 of the elongate channel 1102. The jaw attachment pins 1235 define a fixed jaw pivot axis JA that is substantially traverse to the shaft axis SA. See FIG. 4 . Each of the anvil mounting walls 1136 has a mounting hole 1140 extending therethrough to enable the anvil mounting portion 1134 to be pivotally journaled on the jaw attachment pins 1235. Thus, in such arrangement, the anvil 1130 and the elongate channel 1102 are independently pivotable about the fixed jaw pivot axis JA. Such arrangement may permit the anvil 1130 and elongate channel 1102 (the “jaws”) to be opened to positions that may be wider than those open positions that may be attained by the jaws of other end effector arrangements wherein only one of the jaws moves relative to the other jaw.

Still referring to FIGS. 15A and 15B, the distal closure member 1430 includes two inwardly extending jaw opening pins 1432 that are adapted to extend through corresponding channel opening cam slots 1106 provided in the proximal end 1103 of the elongate channel 1102. Each jaw opening pin 1432 is configured to engage a corresponding anvil opening cam surface 1142 that is formed on each anvil mounting wall 1136. As can be seen in FIGS. 15A and 15B, the anvil opening cam surfaces 1142 are opposed or arranged in an opposite configuration as the corresponding channel opening cam slots 1106. Stated another way, the channel opening cam slots 1106 and the anvil opening cam surfaces 1142 curve in opposite directions from each other.

FIG. 15A illustrates the anvil 1130 and the elongate channel 1102 (the “jaws”) in the fully closed position. As the distal closure member 1430 is advanced distally, the distal end 1431 of the distal closure member 1430 travels up closure cam surfaces 1137 formed on each of the anvil mounting walls 1136 as well as up closure cam surfaces 1108 formed on the proximal end 1103 of the elongate channel 1102. As the distal end 1431 of the distal closure member 1430 cammingly contacts the closure cam surfaces 1137, 1108, the anvil 1130 as well as the elongate channel 1102 are both pivoted about the jaw pivot axis JA to the closed position at which point the distal end 1431 of the distal closure member 1430 contacts a ledge portion 1133 that is formed between the anvil mounting portion 1134 and the anvil body portion 1132 as well as a ledge 1145 on the elongate channel. See FIG. 15A. When the closure member assembly 1400 is locked in position, the distal closure member 1430 retains the anvil 1130 and elongate channel 1102 in that closed position. When the clinician desires to move the anvil 1130 and the elongate channel 1102 to the open position, the distal closure member 1430 is moved in the proximal direction PD. As the distal closure member 1430 is moved in the proximal direction PD, the jaw opening pins 1432 engage the corresponding channel opening cam slots 1106 and the anvil opening cam surfaces 1142 and pivots the anvil 1130 and elongate channel about the fixed jaw axis JA to the open position shown in FIG. 15B. Such use of pins of features on the distal closure member to effectuate movement of both jaws from a fully closed position to a fully open position may be referred to herein as “positive jaw opening” features. Other positive jaw opening arrangements are disclosed in U.S. patent application Ser. No. 14/742,925, entitled SURGICAL END EFFECTORS WITH POSITIVE JAW OPENING ARRANGEMENTS, which has been incorporated by reference in its entirety herein.

FIGS. 16-21 Illustrate an alternative distal closure member 1430′ that employs alternative positive jaw opening features in the form of, for example, movable jaw opening cams 1440 that are attached to the distal closure member 1430′ in place of the jaw opening pins. At least one and preferably two jaw opening cams 1440 are movably attached to the distal closure member 1430′ by a corresponding stretchable coupler 1450. In the illustrated embodiment, the coupler 1450 comprises a cam or tension spring. In the illustrated arrangement, the tension spring 1454 comprises flat spring to save space. A proximal end of each tension spring 1450 has a hook 1452 formed thereon that extends through an opening 1442 in the distal closure member 1430′. An end of each hook 1452 may be seated in a corresponding slot or groove 1444 that is formed in the distal closure member 1430′ as shown in FIG. 16 . A distal end 1455 of each tension spring 1454 is attached to the corresponding jaw opening cam 1440. The proximal end 1103 of the elongate channel 1102 includes a pair of spring clearance slots 1106′ and channel opening cam surfaces 1107 that are configured to be engaged by the jaw opening cams 1440. In alternative arrangements, the spring could include maximum extension features that only allow a predetermined amount of compliance and then assure jaw opening that is proportionate to the remaining closure trigger travel and therefore closure shuttle motion. As indicated above, each of the anvil mounting walls 1136 has an anvil opening cam surface 1142 formed thereon. As can be seen in FIG. 19 , the anvil opening cam surfaces 1142 are opposed or arranged in an opposite configuration as the corresponding channel opening cam surface 1107. Stated another way, the channel opening cam surface 1107 and the anvil opening cam surfaces 1142 are arcuate and curve in opposite directions.

FIGS. 20 and 21 illustrate the anvil 1130 and elongate channel 1102 in their respective fully opened positions. As can be seen in each of those Figures, the jaw opening cams 1440 are oriented between the corresponding anvil opening cam surface 1142 and the channel opening cam surface 1107 and are in their proximal-most positions. When in the fully opened positions, the jaw opening cams 1440 are located distal to the distal end of the distal closure member 1430′. As can be seen in FIGS. 19 and 20 , the jaw opening cams 1440 may be wedge-shaped. In at least one arrangement, the wedge geometry has a gradual cam surface on the proximal side to prevent biding between the jaws. When in that fully open position, the tension springs 1454 are in their starting position wherein the tension springs 1454 are applying their smallest amount of biasing force to each of the jaw opening cams 1440. Upon commencement of the closing process, the distal closure member 1430′ is advanced distally in the various manners described herein. As the distal closure member 1430′ is advanced distally, the distal end 1431 contacts the closure cam surfaces 1137 on the anvil mounting portion 1134 and closure cam surfaces 1108 that are formed on the proximal end 1103 of the elongate channel 1102 to pivot the anvil 1130 and the elongate channel 1102 toward each other about the pivot jaw axis JA. As the anvil 1130 and the elongate channel 1102 are pivoted toward each other, the jaw opening cams 1440 that are riding on cam surfaces 1142 and 1104 are driven in the distal direction. As the jaw opening cams 1440 are driven distally, the tension springs 1454 are elongated and “loaded”.

FIGS. 18 and 19 depict the anvil 1130 and elongate channel 1102 in their fully closed positions. When the clinician desires to return the anvil 1130 and elongate channel 1102 to their fully open positions (FIGS. 20 and 21 ), the distal closure member 1430′ is withdrawn in the proximal direction which permits the anvil 1130 and the elongate channel 1102 to pivot away from each other about the pivot jaw axis JA. Because the tension springs 1454 are elongated and loaded, they draw each of the jaw opening cams 1440 in the proximal direction. As the jaw opening cams 1440 move in the proximal direction PD between the cam surfaces 1142 and 1107, the anvil 1130 and the elongate channel 1102 are positively moved to the fully opened position and retained therein by the jaw opening cams 1440. The more that the distal closure member is moved proximally, the more the jaws are urged away from each other. Such compliant positive jaw opening arrangements may assure direct one-to-one final pull open to provide more opening force if stuck.

FIGS. 22-25 Illustrate an alternative distal closure member 1430″ that employs jaw opening tabs as well as at least one jaw opening spring 1460 to move the anvil 1130 and the elongate channel 1102′ into their respective fully opened positions. As can be seen in FIGS. 24 and 25 , the distal closure member 1430″ is similar to distal closure member 1430 as described above, except that distal closure member 1430″ additionally includes an anvil open tab 1435 and a channel open tab 1437. As shown in FIG. 24 , when the distal closure member 1430″ has been moved to its proximal most position corresponding to the fully opened position, the anvil open tab 1435 is in contact with the tab 1139 on the anvil mounting portion 1134 and the channel opening tab is in contact with a channel tab 1109 protruding from the underside of the proximal end portion 1103 of the elongate channel 1102′.

The embodiment depicted in FIGS. 22, 24 and 25 also employs a positive jaw opening member which may comprise a jaw opening spring 1460. As can be seen in FIG. 23 , in the illustrated arrangement, the jaw opening spring 1460 includes an anvil opening leg 1462 and a channel opening leg 1464 that are attached by a bridge portion 1463. The spring 1460 may be journaled on the jaw attachment pins 1235 as shown in FIGS. 22, 24 and 25 such that the anvil opening leg 1462 bears on a bottom surface of the anvil mounting portion 1134 and the channel opening leg 1464 bears on a bottom surface of the proximal end 1103 of the elongate channel 1102′. Thus, the jaw opening spring 1460 serves to apply biasing forces to the anvil 1130 and the elongate channel 1102′ to pivot them away from each other to open positions. FIG. 25 illustrates the anvil 1130 and the elongate channel 1102′ in the fully closed position. As can be seen in FIG. 25 , the jaw opening spring 1460 is in its fully compressed state. To open the anvil and channel 1102′, the distal closure member 1430″ is moved in the proximal direction PD in the various manners disclosed herein. As the distal closure member 1430″ moves proximally, the jaw opening spring 1460 positively biases the anvil 1130 and the elongate channel 1102′ away from each other about the pivot axis JA to the fully open position wherein the anvil opening tab 1435 engages the tab 1139 on the anvil mounting portion 1134 and the channel opening tab 1437 engages the channel tab 1109. See FIG. 24 . In at least one arrangement, the jaw opening spring is mounted proximal to the firing member parking area (i.e., the area where the firing member resides when in the starting position).

FIGS. 26-29 Illustrate an alternative distal closure member 1470 that employs slot arrangements in the elongate channel and closure member that are configured to move an anvil 1130″ between a fully open position and a fully closed position. In the illustrated arrangement, the distal closure member 1470 is similar to distal closure member 1430 as described above, except for the differences discussed below. In this arrangement, however, only the anvil 1130″ moves relative to the elongate channel 1102″. As can be seen in FIGS. 26-29 , the anvil mounting portion 1134 of the anvil 1130″ includes two outwardly extending anvil pins 1150 that extend through corresponding channel slots 1472 provided in the proximal end 1103 of the elongate channel 1102″. Each anvil pin 1150 also extends into corresponding closure slots 1474 in the distal closure member 1470. In the illustrated arrangement, each of the channel slots 1472 extends along a vertical axis VA. The anvil pins 1150 define a pivot axis PA about which the anvil 1130″ may pivot. Because the anvil pins 1150 are constrained to only move within the vertically extending channel slots 1472, the pivot axis PA is constrained to only move along the vertical axis VA. Each closure slot 1474 has a proximal portion 1476 and a distal portion 1478. The proximal portion 1476 lies along a first horizontal axis HA₁ and the distal portion 1478 lies along a second horizontal axis HA₂ that is offset from the first horizontal axis HA₁. See FIG. 26 . Vertical axis VA is transverse to the first and second horizontal axes HA₁ and HA₂.

FIG. 26 illustrates the positions of the anvil 1130″ and the elongate channel 1102″ when in the fully open position. As can be seen in FIG. 26 , when in that position, the anvil pins 1150 are located at the top end of the channel slot 1472 (“first vertical positions”) as well as in the distal portion 1478 of the closure slots 1474. FIG. 27 illustrates the positions of the anvil 1130″ and the elongate channel 1102″ after the closure process has been commenced. As can be seen in FIG. 27 , the distal closure member 1470 has begun to move distally so that the anvil pins 1150 are just about to enter the proximal portion 1476 of the closure slots and the pins have begun to move downward in the channel slots 1472. In FIG. 28 , the distal closure member 1470 has moved distally to a point wherein the anvil pins 1150 are at the bottom ends of the channel slots 1472 and the anvil pins 1150 have now entered the proximal portions 1476 of the closure slots 1474. Thus the anvil mounting portion 1134 has moved downward toward the elongate channel 1102″. FIG. 29 illustrates the anvil 1130″ and the elongate channel anvil 1102″ in their fully closed positions. As can be seen in FIG. 29 , the anvil pins 1150 are retained in the bottom ends of the channel slots 1472 (“second vertical positions”) and are also received within the proximal portions 1476 of the closure slots 1474. The anvil 1130″ and elongate channel 1102″ are retained in that fully closed position while the distal closure member 1470 is retained in that position. As can be seen in FIG. 29 , such arrangement facilitates the vertical travel of the anvil mounting portion 1134 relative to the channel 1102″ thereby increasing the distance between the underside of the anvil and the cartridge deck when in the fully opened position. Such redundant linkage arrangement may allow for the adjustment of the proximal distance between the anvil and the cartridge deck adjacent the tissue stops. Another cartridge embodiment may include a metallic camming termination feature proximal to the sled start location. Such metallic feature may support or hold the sled in the “ready-to-use” position while preventing the collapse of the tail.

FIGS. 30-32 illustrate one form of a firing member 1760 that may be employed with the interchangeable tool assembly 1000. In one exemplary form, the firing member 1760 comprises a body portion 1762 that includes a proximally extending connector member 1763 that is configured to be received in a correspondingly shaped connector opening 1624 (FIG. 4 ) in the distal end of the distal firing bar 1620. The connector 1763 may be retained within the connector opening 1624 by friction and/or welding or suitable adhesive, etc. In use, the body portion 1762 protrudes through an elongate slot 1160 in the elongate channel 1102. A laterally extending foot tab 1764 extends from each lateral side of the body portion 1762. Each foot tab 1764 includes a proximal end 1765 that has a thickness PE_(f) and a distal end 1767 that has a thickness DE_(f). Such configuration also defines an upper foot surface 1768 and a lower foot surface 1769. In the illustrated reference the upper foot surface 1768 and the lower foot surface 1769 angle away from each other. In FIG. 31 , the upper foot surface 1768 is parallel to the upper axis U_(A) and the lower foot surface 1769 is parallel to lower axis U_(L) with an angle A_(F) therebetween. Stated another way, the distal thickness DE_(f)>the proximal thickness PE_(f). Thus, each of the foot tabs 1764 taper in thickness from their respective distal end 1767 to their proximal end 1765 with the proximal end being thinner.

Still referring primarily to FIG. 31 , the illustrated firing member 1760 also includes a pair of laterally extending top tabs 1770. Each top tab 1770 includes a proximal end 1772 that has a thickness PE_(T) and a distal end 1774 that has a thickness DE_(T). Such configuration also defines a top surface 1776 and a bottom surface 1778. In the illustrated reference the top surface 1776 and the bottom surface 1778 angle away from each other. In FIG. 31 , the top surface 1776 is parallel to an upper axis T_(A) and the bottom surface 1778 is parallel to a bottom axis B_(L) with an angle A_(T) therebetween. Stated another way, a distal thickness DE_(T) of each top tab 1770 is greater than proximal thickness PE_(T) thereof. Thus, each of the top tabs 1770 taper in thickness from their respective distal end 1774 to their proximal end 1772 with the proximal end 1772 being thinner. In the illustrated arrangement angle A_(F) may be approximately equal to angle A_(T). In addition, the top surface 1776 of each of the top tabs 1770 may be a distance H_(F) from the lower foot surface 1769 of each corresponding foot tab 1764 between the distal ends 1774, 1765, respectively and also be a distance H_(R) from each other at their respective proximal ends 1772, 1767. In the illustrated arrangement, H_(F)>H_(R). Thus, the top surface 1776 of each top tab 1770 angles away from the shaft axis SA and each lower foot surface 1769 of each foot tab 1764 angles away from the shaft axis SA. The illustrated firing member 1760 further includes laterally protruding central lock lugs 1780 which will be discussed in further detail below. The body portion 1762 of the firing member 1760 further includes a tissue cutting edge or feature 1766 that is disposed between a distally protruding bottom portion 1771 and a distally protruding top nose portion 1773.

In the illustrated example, the cartridge body 1111 operably supports therein a plurality of staple drivers that are aligned in rows on each side of a centrally disposed slot 1114. FIGS. 33A-33C illustrate one example of a staple driver 1170 that may be employed to support staples on one side of a surgical staple cartridge. The drivers located on the opposite side of the centrally disposed slot 1114 may comprise mirror images of drivers 1170. Other staple driver configurations may also be effectively employed as well. As can be seen in FIGS. 33A-33C, one form of a staple driver 1700 comprises a staple driver body 1172. The driver body 1172 includes a first or innermost staple support portion 1174 that is configured to support a staple (not shown) thereon. A second or central staple support portion 1176 is configured to support another staple (not shown) thereon and a third support portion 1870 that is configured to support a third staple (not shown) thereon. The first staple support portion 1174, the second staple support portion 1176 and the third staple support portion 1178 are all coupled together by a connector portion 1180. In at least one arrangement, the connector portion 1180 is formed with a centrally disposed opening or aperture 1182 that is configured to slidably receive a corresponding first driver guide (not shown) that is formed in the cartridge body. The connector portion 1180 includes a first cam portion 1184 that has a first camming surface or ramp 1186 formed thereon. The connector portion 1180 also includes a second cam portion 1188 that has a second a second camming surface 1190 formed thereon. The camming surfaces 1186, 1190 have the same slope or angle or they may have different slopes/angles. In at least one embodiment, each staple driver 1170 is integrally formed from or molded from, for example, Ultem®, with no fill. However, other materials such as, for example, Ultem® with a glass or mineral fill or Nylon or Nylon with a glass file could be used. In other arrangements, the various portions of the staple drivers 1170 may be separately fabricated from other materials and be attached together by adhesive, solder, etc. Further details concerning the staple drivers 1170 as well as other driver embodiments that may be effectively employed with the various embodiments disclosed herein may be found in U.S. patent application Ser. No. 14/843,243, filed Sep. 2, 2015, entitled SURGICAL STAPLE CONFIGURATIONS WITH CAMMING SURFACES LOCATED BETWEEN PORTIONS SUPPORTING SURGICAL STAPLES, the entire disclosure of which is hereby incorporated by reference herein.

Turning next to FIGS. 33, 36 and 37 , the firing member 1760 is configured to operably interface with a sled assembly 1120 that is operably supported within the body 1111 of the surgical staple cartridge 1110. The sled assembly 1120 is slidably displaceable within the surgical staple cartridge body 1111 from a proximal starting position adjacent the proximal end 1112 of the cartridge body 1111 to an ending position adjacent the distal end 1113 of the cartridge body 1111. See FIG. 4 . The centrally disposed slot 1114 enables the firing member 1760 to pass therethrough and cut the tissue that is clamped between the anvil 1130 and the staple cartridge 1110. The drivers 1170 are associated with corresponding pockets 1116 that open through the upper deck surface 1115 of the cartridge body 1111. The sled assembly 1120 includes a plurality of sloped or wedge-shaped cams 1122 wherein each cam 1122 corresponds to a particular camming surface 1186, 1190 on the corresponding drivers 1170 located on each side of the slot 1114. When the firing member 1760 is fired or driven distally, the firing member 1760 drives the sled assembly 1120 distally as well. As the firing member 1760 moves distally through the cartridge 1110, the tissue cutting feature 1766 cuts the tissue that is clamped between the anvil assembly 1130 and the cartridge 1110 and the sled assembly 1120 drives the drivers 1170 upwardly in the cartridge which drive the corresponding staples or fasteners into forming contact with the anvil assembly 1130. In the illustrated example, the body portion 1762 of the firing member 1760 is configured to engage with the distal end of the sled assembly 1120. In particular, in at least one example, as shown in FIG. 33 , the distal end of the body portion 1762 is oriented to simply contact the proximal end of the center portion of the sled 1120. In other firing member arrangements, the firing member body 1762 may be uniquely shaped or configured to operably mesh, mate or operably interface with the corresponding end portion of the sled assembly contained within a corresponding cartridge assembly so that should the user unwittingly load the wrong cartridge into the elongate channel and thereafter attempt to fire the cartridge, the firing member and sled would not properly interface to enable the distal advancement thereof.

In those embodiments wherein the firing member includes a tissue cutting surface, it may be desirable for the elongate shaft assembly to be configured in such a way so as to prevent the inadvertent advancement of the firing member unless an unspent staple cartridge is properly supported in the elongate channel 1102 of the surgical end effector 1100. If, for example, no staple cartridge is present at all and the firing member is distally advanced through the end effector, the tissue would be severed, but not stapled. Similarly, if a spent staple cartridge (i.e., a staple cartridge wherein at least some of the staples have already been fired therefrom) is present in the end effector and the firing member is advanced, the tissue would be severed, but may not be completely stapled, if at all. It will be appreciated that such occurrences could lead to undesirable catastrophic results during the surgical procedure. U.S. Pat. No. 6,988,649 entitled SURGICAL STAPLING INSTRUMENT HAVING A SPENT CARTRIDGE LOCKOUT, U.S. Pat. No. 7,044,352 entitled SURGICAL STAPLING INSTRUMENT HAVING A SINGLE LOCKOUT MECHANISM FOR PREVENTION OF FIRING, and U.S. Pat. No. 7,380,695 entitled SURGICAL STAPLING INSTRUMENT HAVING A SINGLE LOCKOUT MECHANISM FOR PREVENTION OF FIRING, and U.S. patent application Ser. No. 14/742,933, entitled SURGICAL STAPLING INSTRUMENTS WITH LOCKOUT ARRANGEMENTS FOR PREVENTING FIRING SYSTEM ACTUATION WHEN A CARTRIDGE IS SPENT OR MISSING each disclose various firing member lockout arrangements. Each of those references is hereby incorporated by reference in its entirety herein.

An “unfired”, “unspent”, “fresh” or “new” cartridge 1110 means herein that the cartridge 1110 has all of its fasteners in their “ready-to-be-fired positions”. When in that position, the sled assembly 1120 is located in its starting position. The new cartridge 1110 is seated within the elongate channel 1102 and may be retained therein by snap features on the cartridge body that are configured to retainingly engage corresponding portions of the elongate channel 1102. FIG. 36 illustrates a portion of the surgical end effector 1100 with a new or unfired surgical staple cartridge 1110 seated therein. As can be seen in FIG. 36 , the sled assembly 1120 is in the starting position. To prevent the firing system from being activated and, more precisely, to prevent the firing member 1760 from being distally driven through the end effector 1110 unless an unfired or new surgical staple cartridge has been properly seated within the elongate channel 1102, the illustrated interchangeable surgical tool assembly 1000 employs a firing member lockout system generally designated as 1790.

Referring now to FIGS. 33-37 , in one form, the firing member lockout system 1790 includes movable lock member 1792 that is configured to retainingly engage the firing member 1760 when an unspent surgical staple cartridge 1110 is not properly seated within the elongate channel 1102. The lock member 1792 comprises a pair of lateral spring arms 1793 that are interconnected by a central mount tab feature 1794. The central mount tab feature 1794 has a mounting hook 1795 formed therein that is configured to be hooked over a retaining pin 1238 in the anvil mounting assembly 1230 as can be seen in FIGS. 35-37 . When installed, the mount tab 1794 is configured to bias the lock member 1792 upward. In addition, the lock member 1792 includes two lateral anvil spring arms 1796 that angle upward to engage the bottom surface of a corresponding anvil mounting wall 1136 on the anvil mounting portion 1134 to bias the lock member 1792 downward when the anvil 1130 is closed. A firing member alignment tab 1797 extends upward from each of the lateral spring arms 1793 to maintain alignment between the firing member 1760 and the lock member 1792. As can be most particularly seen in FIG. 33 , the distal portion of each lateral spring arm 1793 includes a laterally extending forward arm 1798 that terminates in a sled tab 1799 that corresponds to a sled boss 1124 that is formed on the outermost wedge-shaped cams 1122 on the sled 1120. Each of the lateral spring arms 1793 includes a lock notch 1850 therein that is configured to lockingly engage a corresponding one of the central lock lugs 1780 therein. Those of ordinary skill in the art will appreciate that different numbers and arrangements of sled bosses may be employed in the sleds of different staple cartridge arrangements. The number of, and arrangement of, the sled boss(es) may be configured to only interact with corresponding sled tabs of the lock member of the proper instrument with which the staple cartridge is intended to be used. Thus, the sled bosses may function as a “key” to only actuate the lock member of the proper device. Such arrangement may therefore prevent the user from actuating the device when the wrong surgical staple cartridge has been loaded into the elongate channel.

FIG. 35 illustrates the end effector 1100 with the anvil 1130 and the elongate channel 1102 in their fully opened position without a surgical staple cartridge installed therein. As can be seen in FIG. 35 , the anvil spring arms 1796 are in contact with the underside of the mounting walls 1136, but they are not “loaded”. Such position enables the surgical staple cartridge 1110 to be seated into the elongate channel 1102. If one were to close the anvil 1130 when in that position, the anvil spring arms 1796 will bias the spring arms 1793 downwardly to cause the central lugs 1780 to be lockingly received within the corresponding lock notch 1850 in the spring arm 1793. When in that position, the firing member 1760 cannot be distally advanced. FIG. 36 illustrates a fresh surgical staple cartridge 1110 properly seated within the elongate channel 1102 when the anvil 1130 is in the fully closed position. As can be seen in FIG. 36 , the sled 1120 is in its starting position. When in that position, the sled bosses 1124 engage the sled tabs 1799 and bias the spring arms 1793 upward to positions wherein the lock notches 1850 do not engage the central tabs 1780. Thus, the firing member 1760 is free to be distally advanced. FIG. 37 illustrates the position of the firing member 1760 after it has been advanced distally from its starting position. As can be seen in FIG. 37 , the firing member 1760 is distal to the lock spring and out of engagement therewith. The anvil spring arms 1796 have biased the lock member downwardly to an unlocked position.

FIGS. 38 and 39 illustrate the position of the firing member 1760 and the lock member 1792 after the firing member 1760 has been initially retracted in the proximal direction. In the illustrated arrangement, each of the central lock lugs 1780 includes a chamfered proximal end portion 1782. See FIGS. 30 and 31 . As the firing member 1760 is retracted to the position shown in FIGS. 38 and 39 , the chamfered proximal ends 1782 of the central lock lugs 1780 contact the corresponding forward arms 1798 of the lock member 1792 and bias the spring arms laterally outwardly (arrow L in FIG. 39 ). FIGS. 40 and 41 illustrate the position of the firing member 1760 and the lock member 1792 after the firing member 1760 has been fully retracted back into its starting position. When in that position, each of the central lock lugs 1780 is lockingly received within the lock notches 1850 in the corresponding spring arm 1793. When in that position, the firing member 1760 cannot be distally advanced.

FIG. 42 illustrates an alternative lock member 1792′. In this embodiment, the mount tab 1794 biases the lock member 1792′ downwardly without the use of anvil spring arms. Thus, the central lock lugs 1780 remain in locking engagement with the spring arms 1793 during opening of the anvil 1130 and elongate jaw 1102 and loading of the surgical staple cartridge 1110 therein.

As discussed above, the cartridge body 1111 has a plurality of anvil pockets 1116 that are serially arranged in lines on both sides of the central slot 1114. Housed within these pockets 1116 are staple drivers that operably support one or more surgical staples or fasteners thereon. When the target tissue is clamped between the anvil 1130 and the staple cartridge deck surface 1115, the target tissue must be so positioned so that the tissue that is severed is stapled on each side of the cut line. To avoid the target tissue from being positioned proximal of the proximal most staples or fasteners, the anvil typically contains downwardly extending walls commonly referred to as “tissue stops” which serve to block the target tissue from getting too far proximal between the anvil and cartridge. As the anvil is closed toward the cartridge, the tissue stops extend downward past the cartridge deck surface to prevent the tissue from being positioned too far proximal between the anvil and cartridge. In at least one of the end effector embodiments described herein, the anvil 1130 and the elongate channel 1102 both can move about the pivot jaw axis JA. Such arrangement may permit the anvil 1130 and the elongate channel 1102 to be opened further than other end effector arrangements wherein only one of the anvil or elongate channel can move or pivot. Stated another way, the distance between the undersurface of the anvil body 1132 and the cartridge deck surface 1115 of a staple cartridge 1110 that is seated in the elongate channel 1102 of the end effector 1110 described herein when both the anvil 1130 and elongate channel 1102 are in their respective fully open positions is generally larger than the distance between the underside of the anvil and the deck surface of a cartridge that is seated in an elongate channel of an end effector wherein only one of the anvil and channel move relative to the other. Thus, at least one form of the end effector 1100 is configured to employ a staple cartridge arrangement with at least one “active” tissue stop or “expandable” tissue stop. In the illustrated arrangement, two active tissue stops generally designated as 1250 are employed.

Turning now to FIGS. 45, 47 and 48 , as discussed above, the staple cartridge body 1111 includes a plurality of staple pockets 1116 located on each side of the elongate slot 1114 that is configured to accommodate the firing member 1760 as it is distally advanced through the cartridge. Depending upon the configuration number and arrangement of the staple pockets 1116, one or more staple driver configurations may be operably supported therein that each supports one or more surgical staples thereon. Some pockets located at the proximal end of the cartridge body may not contain drivers and staples. For example, in the illustrated arrangement, the staple pockets 1116 contain drivers (not shown) and staples (not shown). The proximal most pockets that support a driver and a staple are labeled 1116P. Although additional “unused” pockets (labeled 1117), none of those pockets contain drivers and staples. In the illustrated arrangement, all of the staple pockets 1116 on both sides of the elongate slot 1114 that are to the proximal most pockets 1116P contain drivers and surgical staples. The active tissue stops 1250 are therefore configured to prevent tissue from being clamped between the anvil 1130 and the cartridge 1110 in a position that is proximal to the proximal staple pockets 1116P to prevent the tissue from being cut without first being stapled.

In one arrangement, the surgical staple cartridge 1110 alone and/or in combination with the elongate channel 1102 may be referred to herein as the “first jaw” and the anvil 1130 may be referred to as the “second jaw”. The proximal end 1112 of the staple cartridge 1110 may be referred to as the “first proximal end” or the proximal end of the first jaw. The deck surface 1115 may be referred to as the ‘first jaw surface”. In the illustrated arrangement, the anvil body 1132 includes a staple forming undersurface 1135 that faces the cartridge deck and serves to form the staples as they are driven into contact therewith. The staple forming undersurface 1135 (FIG. 3 ) may also be referred to herein as the “second jaw surface”.

In the illustrated arrangement, the active tissue stops 1250 are operably attached to the cartridge body 1111. However, other arrangements are contemplated wherein the active tissue stops are attached to portions of the elongate channel 1102.

Turning to FIG. 45 , in at least one arrangement, two active or expandable tissue stops 1250 are employed—one tissue stop on each side of the elongate slot 1114. As can be seen in FIG. 47 , an active tissue stop 1250 comprises a bifurcated lower tissue stop portion 1260 that comprises two cam walls 1262 that are separated by a space 1264 and are interconnected by a connector 1265. Movably supported within the space 1264 is an upper tissue stop portion 1270. As can be seen in FIG. 45 , a stop bridge 1266 is provided between the walls 1260 at the upper portion of their distal ends. The stop bridge 1266 cooperates with a stop tab 1272 formed on the upper tissue stop portion 1270 to prevent the upper tissue stop portion 1270 from extending completely out of the space 1264. Mounting holes 1267 are provided through the walls 1260 to enable the lower tissue stop portion 1260 to be pivotally journaled on a corresponding stop pin 1118 that protrudes laterally out of the sides 1113 of the cartridge body 1111. As can also be seen in FIG. 45 , each of the upper stops 1270 includes a spring mounting hole 1274 that is configured to receive a leg portion 1282 of a biasing member or stop spring 1280 therein. See FIG. 46 .

The upper tissue stop portion 1270 is slidably received within the space 1264 of the corresponding lower tissue stop portion 1260 to create the active or expandable tissue stop 1250. The upper and lower tissue stop portions 1260, 1270, along with the corresponding biasing member or stop spring 1280, are pivotally journaled on the corresponding stop pin 1118. Each active tissue stop assembly 1250 is free to pivot about a tissue stop axis TSA that is defined by the stop pins 1118. As can be seen in FIG. 45 , the tissue stop axis TSA is transverse to the elongate slot 1114 in the cartridge body 1111. A second leg 1284 of the stop spring 1280 bears upon a corresponding ledge or portion 1119 of the cartridge body 1111 such that when journaled on the stop pin 1118, the stop spring 1280 serve to bias the upper tissue stop portion 1270 upward within the space 1264 until the stop tab 1272 contains the stop bridge 1266. At that point, the biasing member or stop spring 1280 serves to bias the entire active tissue stop assembly 1250 upward about the tissue stop axis TSA until the upper tissue stop portion 1270 contacts a corresponding stop ledge 1121 formed on the cartridge body 1111.

Thus, in the illustrated arrangement, each of the active tissue stop assemblies 1250 are attached to a corresponding lateral side 1113 of the cartridge body 1110. As can be seen in FIG. 45 , each side wall 1126 of the elongate channel 1102 has a tissue stop notch 1128 formed therein to receive an active tissue stop assembly 1250 therein when the jaws 1130, 1110 are in their fully closed positions. FIG. 49 illustrates the anvil 1130 and elongate channel 1102 and cartridge 1110 in their “fully closed” positions. The orientations of the active tissue stop assemblies 1250 when the anvil 1130 and elongate channel 1102 or surgical cartridge 1110 are in their fully closed positions may be referred to as their “fully compressed” orientations. In certain embodiments the anvil assembly 1130 may also have fixed tissue stops 1144 formed thereon which are proximal to the active tissue stop assemblies 1250. See FIGS. 43 and 44 . FIGS. 47 and 50 illustrate the orientation of an active tissue stop assembly 1250 when the anvil 1130 and the elongate channel 1102 are in their respective fully opened positions. The orientations of the active tissue stop assemblies 1250 when the anvil 1130 and elongate channel 1102 or surgical cartridge 1110 are in their fully open positions may be referred to as their “fully deployed” or “fully expanded” orientations. When in their fully deployed position, the active tissue stops 1250 serve to prevent tissue from significantly advancing proximally past the proximal most staple pockets 1116P. FIG. 49 illustrates the anvil 1130 and elongate channel 1102 clamping tissue therebetween in their respective fully closed positions. Prior to being installed within the elongate channel 1102, the tissue stop assemblies may be retained in the collapsed orientation shown in FIG. 49 by a removably staple cover that is removably attached to the cartridge deck. Once the cartridge is installed in the elongate channel, the staple cover maybe removed from the cartridge deck.

FIGS. 51-53 illustrate another tissue stop arrangement that comprises cooperating tissue stops on the anvil as well as the cartridge. For example, in the embodiment shown in FIGS. 51-53 , a pair of upstanding cartridge tissue stops 1290 that extend upward from the cartridge deck surface 1115. When the anvil 1130 and the elongate channel 1102 are in their fully closed positions, the upper ends 1292 of the cartridge tissue stops 1290 extend into holes or cavities 1293 provided in the anvil body 1132. The upper ends 1292 of the cartridge tissue stops 1290 are angled so that when the anvil 1130 and elongate channel 1102 are fully closed, the upper ends 1292 do not protrude beyond the outer surface of the anvil body 1132. See FIG. 53 . In addition, the anvil 1130 includes downwardly extending distal tissue stops 1296 that do not extend below the cartridge deck surface 1115 when the anvil 1130 and the elongate channel 1102 are in their fully closed positions and a pair of proximal tissue stops 1298 that extend downwardly below the deck surface 1115 of the cartridge 1110 when the anvil 1130 and elongate channel 1102 are in their fully closed position. See FIG. 53 . In an alternative arrangement, an elastic band may be placed around the exterior of the jaws such that the distal edge of the band is at the desired location for the tissue stops. As the jaws are opened, the band stretches but serves as a tissue stop. The band can rest in recesses in the anvil and elongate channel that circumscribe the anvil/channel so that the end effector can pass through standard trocar arrangements.

In the illustrated example, the cartridge body 1111 operably supports therein a plurality of staple drivers that are aligned in rows on each side of a centrally disposed slot 1114. FIGS. 33A-33C illustrate one example of a staple driver 1170 that may be employed to support staples on one side of a surgical staple cartridge. The drivers located on the opposite side of the centrally disposed slot 1114 may comprise mirror images of drivers 1170. Other staple driver configurations may also be effectively employed as well. As can be seen in FIGS. 33A-33C, one form of a staple driver 1700 comprises a staple driver body 1172. The driver body 1172 includes a first or innermost staple support portion 1174 that is configured to support a staple (not shown) thereon. A second or central staple support portion 1176 is configured to support another staple (not shown) thereon and a third support portion 1870 that is configured to support a third staple (not shown) thereon. The first staple support portion 1174, the second staple support portion 1176 and the third staple support portion 1178 are all coupled together by a connector portion 1180. In at least one arrangement, the connector portion 1180 is formed with a centrally disposed opening or aperture 1182 that is configured to slidably receive a corresponding first driver guide (not shown) that is formed in the cartridge body. The connector portion 1180 includes a first cam portion 1184 that has a first camming surface or ramp 1186 formed thereon. The connector portion 1180 also includes a second cam portion 1188 that has a second a second camming surface 1190 formed thereon. The camming surfaces 1186, 1190 have the same slope or angle or they may have different slopes/angles. In at least one embodiment, each staple driver 1170 is integrally formed from or molded from, for example, Ultem®, with no fill. However, other materials such as, for example, Ultem® with a glass or mineral fill or Nylon or Nylon with a glass file could be used. In other arrangements, the various portions of the staple drivers 1170 may be separately fabricated from other materials and be attached together by adhesive, solder, etc. Further details concerning the staple drivers 1170 as well as other driver embodiments that may be effectively employed with the various embodiments disclosed herein may be found in U.S. patent application Ser. No. 14/843,243, filed Sep. 2, 2015, entitled SURGICAL STAPLE CONFIGURATIONS WITH CAMMING SURFACES LOCATED BETWEEN PORTIONS SUPPORTING SURGICAL STAPLES, the entire disclosure of which is hereby incorporated by reference herein.

The staple cavities 1116 are angularly oriented relative to the shaft axis SA. More specifically, the staple cavities 1116 are oriented at oblique angles relative to the shaft axis SA and form a herringbone pattern in the deck surface 1115. Various alternative patterns for staple cavities in a staple cartridge body are described herein.

Variations to the arrangement and/or geometry of staples in a staple line can affect the flexibility and sealing properties of the staple line. For example, a staple line comprised of linear staples can provide a limited amount of flexibility or stretch because the staple line can flex or stretch between the linear staples. Consequently, a limited portion of the staple line (e.g., the portion between staples) is flexible. A staple line comprised of angularly-oriented staples can also flex or stretch between the staples. However, the angularly-oriented staples are also able to rotate, which provides an additional degree of stretch within the staple line. A staple line comprised of angularly-oriented staples can stretch in excess of 60%, for example. In certain instances, a staple line comprised of angularly-oriented staples can stretch at least 25% or at least 50%, for example. The arrangement of staples includes the relative orientation of the staples and the spacing between the staples, for example. The geometry of the staples includes the size and shape of the staples, for example. The flexibility and sealing properties of a staple line can change at longitudinal and/or lateral positions based on the arrangement and/or geometry of the staples. In certain instances, it is desirable to alter the flexibility and/or sealing properties of a staple line at one or more locations along the staple line. For example, it can be desirable to maximize the flexibility of the staple line or a portion thereof. Additionally or alternatively, it can be desirable to minimize the flexibility of the staple line or a portion thereof. It can also be desirable to maximize the sealing properties of the staple line or a portion thereof. Additionally or alternatively, it can be desirable to minimize the sealing properties of the staple line or a portion thereof.

The arrangement of staple cavities in a staple cartridge corresponds to the arrangement of staples in a staple line generated by the staple cartridge. For example, the spacing and relative orientation of staple cavities in a staple cartridge corresponds to the spacing and relative orientation of staples in a staple line generated by the staple cartridge. In various instances, a staple cartridge can include an arrangement of staples cavities that is selected and/or designed to optimize the flexibility and/or sealing properties of the resultant staple line. A surgeon may select a staple cartridge having a particular arrangement of staple cavities based on the surgical procedure to be performed and/or the properties of the tissue to be treated during the surgical procedure, for example.

In certain instances, it can be desirable to generate a staple line with different staple patterns. A staple line can include a first pattern of staples for a first portion thereof and a second pattern of staples for a second portion thereof. The first pattern and the second pattern can be longitudinally offset. For example, the first pattern can be positioned at the proximal or distal end of the staple line. In other instances, the first pattern and the second pattern can be laterally offset and, in still other instances, the first pattern and the second pattern can be laterally offset and longitudinally offset. A staple line can include at least two different patterns of staples.

In certain instances, the majority of staples in a staple line can form a major pattern and other staples in the staple line can form one or more minor patterns. The major pattern can span a significant portion of the staple line and can include a longitudinally-repetitive sub-pattern. In certain instances, the minor pattern, or irregularity, can deviate from the major pattern. The minor pattern can be an anomaly at one or more locations along the length of the staple line, for example. The different patterns in a staple line can be configured to produce different properties at predefined locations. For example, the major pattern can be a highly flexible or elastic pattern, which can permit extensive stretching of the stapled tissue, and the minor pattern can be less flexible or less elastic. It can be desirable for the majority of the staple line to be highly flexible and for one or more limited portions to be less flexible, for example. In other instances, the minor pattern can be more flexible than the major pattern. In certain instances, because the minor pattern extends along a shorter portion of the staple line, the flexibility of the minor pattern may not impact, or may not significantly impact, the overall flexibility of the entire staple line.

Referring now to FIGS. 54-57 , a staple cartridge body 3000 for use with a surgical end effector is depicted. The staple cartridge body 3000 includes a deck 3002 and a slot 3004, which extends through the deck 3002 from a proximal end 3006 toward a distal end 3008 of the cartridge body 3000. The slot 3004 extends along the longitudinal axis LA (FIG. 56 ) of the cartridge body 3000. Staple cavities 3010 are defined in the cartridge body 3000 and each staple cavity 3010 defines an opening 3012 in the deck 3002.

The majority of the staple cavities 3010 are arranged in a first pattern, or major pattern, 3020. The first pattern 3020 is a longitudinally-repetitive pattern of angularly-oriented staple cavities 3010. Longitudinally-repetitive patterns are patterns in which a sub-pattern or arrangement is longitudinally repeated. For example, an arrangement of three staple cavities on each side of the slot 3004 (an inner staple cavity, an intermediate staple cavity, and an outer staple cavity) can be repeated along at least a portion of the length of the staple cartridge body 3000. Various longitudinally-repetitive patterns of angularly-oriented staples cavities are described in U.S. patent application Ser. No. 14/498,145, filed Sep. 26, 2014, now U.S. Patent Application Publication No. 2016/0089142, entitled METHOD FOR CREATING A FLEXIBLE STAPLE LINE, which is incorporated by reference herein in its entirety. The openings 3012 of the staple cavities 3010 in the first pattern 3020 form a herringbone pattern having six rows of angularly-oriented staple cavity openings 3012 in the cartridge deck 3002. An inner row 3014 a, an intermediate row 3014 b, and an outer row 3014 c of staple cavities 3010 are positioned on each side of the slot 3004.

Each staple cavity opening 3012 has a proximal end 3016 and a distal end 3018. The proximal end 3016 and the distal end 3018 of the staple cavities 3010 in the first pattern 3020 are laterally offset. Stated differently, each staple cavity 3010 in the first pattern 3020 is angularly oriented relative to the longitudinal axis LA (FIG. 56 ). A cavity axis CA (FIG. 56 ) extends between the proximal end 3016 and the distal end 3018 of each opening 3012. The cavity axes CA are obliquely oriented relative to the slot 3004. More specifically, the openings 3012 in the inner rows 3014 a of staple cavities 3010 and the outer rows 3014 c of staple cavities 3010 are oriented at 45 degrees, or about 45 degrees, relative to the longitudinal axis LA, and the openings 3012 in the intermediate rows 3014 b of staple cavities 3010 are oriented at 90 degrees, or about 90 degrees, relative to the openings 3012 of the inner rows 3014 a and the outer rows 3014 a.

Certain staple cavities 3010 in the cartridge body 3000 are oriented at an angle that is anomalous or irregular with respect to the staple cavities 3010 in the first pattern 3020. More specifically, the angular orientation of proximal staple cavities 3010 a, 3010 b, 3010 c, and 3010 d and distal staples cavities 3010 e, 3010 f, 3010 g, and 3010 h does not conform to the herringbone arrangement of the staple cavities 3010 in the first pattern 3020. Rather, the proximal staple cavities 3010 a-3010 d and the distal staple cavities 3010 e-3010 h are angularly offset from the staple cavities 3010 in the first pattern 3020. The proximal staple cavities 3010 a, 3010 b, 3010 c, and 3010 d are obliquely oriented relative to the staples cavities 3010 in the first pattern 3020, and the distal staple cavities 3010 e, 3010 f, 3010 g, and 3010 h are also obliquely oriented relative to the staples cavities 3010 in the first pattern 3020. The proximal and distal staple cavities 3010 a-3010 h are oriented parallel to the slot 3004 and to the longitudinal axis LA.

The proximal staple cavities 3010 a-3010 d form a proximal pattern 3022 that is distinct from the first pattern 3020, and the distal staple cavities 3010 e-3010 h form a distal pattern 3024 that is also distinct from the first pattern 3020. In the depicted arrangement, the proximal pattern 3022 includes a first pair of parallel, longitudinally-aligned staple cavities 3010 a, 3010 b on a first side of the slot 3004 and a second pair of parallel, longitudinally-aligned staple cavities 3010 c, 3010 d on a second side of the longitudinal slot 3004. The distal pattern 3024 also includes a first pair of parallel, longitudinally-aligned staple cavities 3010 e, 3010 f on the first side of the longitudinal slot 3004 and a second pair of parallel, longitudinally-aligned staple cavities 3010 g, 3010 h on the second side of the longitudinal slot 3004. In other instances, the distal pattern 3024 can be different from the proximal pattern 3022.

The proximal pattern 3022 and the distal pattern 3024 are symmetric relative to the longitudinal axis LA. In other instances, the proximal pattern 3022 and/or the distal pattern 3024 can be asymmetric relative to the longitudinal axis LA. For example, the staple cavities 3010 e and 3010 f can be longitudinally offset from the staple cavities 3010 g and 3010 h and/or the staple cavities 3010 a and 3010 b can be longitudinally offset from the staple cavities 3010 c and 3010 d. Additionally or alternatively, in certain instances, the staple cartridge body 3000 can include either the proximal pattern 3022 or the distal pattern 3024. In other instances, the staple cavities 3010 defined in the staple cartridge body 3000 can include additional and/or different patterns of staple cavities 3010.

Referring primarily to FIG. 54 , atraumatic extenders 3030 extend or protrude from the deck 3002 around a portion of the staple cavities 3010 in the first pattern 3020. The atraumatic extenders 3030 surround the proximal and distal ends 3016 and 3018, respectively, of the openings 3012 of the staple cavities 3010 in the first pattern 3020. The atraumatic extenders 3030 may be configured to grip tissue that is clamped by the end effector. Additionally or alternatively, in certain instances, the tips of the staple legs can protrude from the cartridge body 3000. In such instances, the atraumatic extenders 3030 may be configured to extend flush with and/or beyond the tips of the staple legs to prevent the tips from prematurely penetrating tissue. Consequently, larger staples, e.g., staples having longer legs, can be positioned in the staple cavities 3010 having atraumatic extenders 3030 positioned therearound. For example, referring again to FIG. 54 , larger staples can be positioned in the staple cavities 3010 in the first pattern 3020 than the staples in the staple cavities in the proximal pattern 3022 and the distal pattern 3024 without risking premature piercing of tissue by the longer staple legs. In certain instances, atraumatic extenders 3030 can be positioned around staples cavities 3010 in the proximal pattern 3022 and/or the distal pattern 3024, and larger staples can be positioned in one of more of those staple cavities 3010 a-3010 h, as well.

The staple cartridge body 3000 can be configured to generate a staple line having different properties along the length thereof. A staple line 3040 generated by the staple cartridge body 3000 and embedded in tissue T is depicted in FIG. 58 . The staple line 3040 is comprised of staples 3042, and an exemplary staple 3042 for use with various staple cartridges described herein is depicted in FIG. 59 . The staple 3042 can be comprised of a bent wire, for example. The wire can have a diameter of 0.0079 inches, or approximately 0.0079 inches. In other instances, the wire can have a diameter of 0.0089 inches, or approximately 0.0089 inches. In still other instances, the wire can have a diameter of 0.0094, or approximately 0.0094 inches. In certain instances, the wire can have a diameter of less than 0.0079 inches or more than 0.0094 inches. The reader will appreciate that the diameter of the wire can dictate the diameter of the staple. The staple 3042 is a substantially U-shaped staple having a base 3050, a first leg 3052 extending from a first end of the base 3050, and a second leg 3054 extending from a second end of the base 3050. The first leg 3052 is substantially parallel to the second leg 3054 and substantially perpendicular to the base 3050. When implanted in tissue T, the angular orientation of the base 3050 corresponds to the angular orientation of the staple cavity opening 3012 from which the staple 3042 was fired.

Another exemplary staple 3142 for use with various staple cartridges described herein is depicted in FIG. 60 . The staple 3142 is a substantially V-shaped staple having a base 3150, a first leg 3152 extending from a first end of the base 3050, and a second leg 3154 extending from a second end of the base 3150. The first leg 3152 is obliquely oriented relative to the second leg 3154 and the base 3150. When implanted in tissue T, the orientation of the base 3150 corresponds to the orientation of the staple cavity opening 3012 from which the staple 3142 was fired. The reader will appreciate that staples having different geometries can also be fired from the staple cartridges described herein.

Referring again to FIG. 58 , the staple line 3040 includes a first portion 3044, a proximal portion 3046, and a distal portion 3048. The first portion 3044 is generated from the first pattern, or major pattern, 3020 and extends along a substantial portion of the staple line 3040. Owing to the angular orientation of the staples 3042 in the first portion 3044, the first portion 3044 is substantially flexible or compliant. For example, because the angularly-oriented staples 3042 can rotate within the stapled tissue T while minimizing trauma to the tissue T, the first portion 3044 is configured to stretch or extend longitudinally and/or laterally as the stapled tissue stretches.

The proximal portion 3046 is generated from the proximal pattern 3022 and forms the proximal end of the staple line 3040. The distal portion 3048 is generated from the distal pattern 3024 and forms the distal end of the staple 3040. Owing to the parallel orientation of the staples 3042 in the proximal portion 3046 and the distal portion 3048 of the staple line 3040, the proximal portion 3046 and the distal portion 3046 of the staple line 3040 can be less flexible than the first portion 3044. However, the reduced flexibility of the proximal portion 3046 and the distal portion 3048 may not impact, or not substantially impact, the overall flexibility of the staple line 3040. Moreover, as described herein, the proximal portion 3046 and the distal portion 3048 may not extend adjacent to the cutline and, in certain instances, the proximal portion 3046 may be absent or missing from the staple line 3040.

A firing element, such as the firing member 1760 (FIG. 4 ), is configured to move along at least a portion of the slot 3004 to fire the staples 3042 from the staple cavities 3010. The firing element can include and/or engage one of more wedge sleds and/or camming surfaces, such as the sled assembly 1120 having wedge-shaped cams 1122 (FIG. 4 ). The cams of the sled are configured to drive the staples upward toward a staple-forming surface, such as into forming pockets in the anvil 1130 (FIGS. 1, 3 and 4 ), for example. Referring to FIG. 55 , the staple cartridge body 3000 includes a plurality of channels 3036 along a bottom surface 3034 through which the wedge-shaped cams can move during a firing stroke.

In use, target tissue is clamped between the staple cartridge body 3000 and an anvil, such as the anvil 1130 (FIGS. 1, 3 and 4 ). The tissue overlapping the staple cavities 3010 is stapled. If tissue is not positioned over certain staple cavities 3010, staples fired from those staple cavities 3010 may not engage the tissue. An anvil typically contains downwardly extending sidewalls commonly referred to as “tissue stops”. The tissue stops are configured to block the target tissue from getting too far proximal between the anvil and cartridge. For example, referring to the end effector 1100 in FIG. 4 , the anvil 1130 includes tissue stops 1131, which extend toward the staple cartridge 1110. When the anvil 1130 is closed toward the cartridge 1110, the tissue stops 1131 on either side of the anvil 1130 extend downward past the cartridge deck surface 1115 and form a wall or barrier, which prevents tissue from being positioned too far proximal between the anvil 1130 and cartridge 1110. The distal ends of the tissue stops 1131 define a proximal starting point for the cutline. A proximal axis PA corresponding to the distal ends of the tissue stops 1131 is depicted in FIG. 56 . Because target tissue is not positioned proximal to the proximal axis PA, the staples that are fired from the staple cavities located proximal to the proximal axis PA, i.e., the proximal staple cavities 3010 a-3010 d, are not fired into the target tissue. In such instances, staples fired from the proximal pattern 3022 do not form a part of the staple line.

A cutting element 3028 (FIG. 56 ) is also configured to move along the longitudinal slot 3004. In various instances, the cutting element 3028 can be an integral part of the firing element, such as the tissue cutting feature 1766 on the firing member 1760 (FIG. 4 ), for example. The cutting element 3028 has a distal cutting edge 3029 that is configured to incise tissue clamped by the end effector and stapled by the staples 3042. Referring primarily to FIG. 56 , the cutting edge 3029 of the cutting element 3028 is configured to move between a proximal position near the proximal end portion 3006 of the cartridge body 3000 and a distal position near the distal end portion 3008 of the cartridge body 3000. The distal-most position of the cutting edge 3029 is defined by a distal termination point for the cutline. A distal axis DA corresponding to the distal termination point of the cutting edge 3029 is depicted in FIG. 56 . Tissue positioned distal to the distal axis DA is not incised by the cutting element 3028 during the firing stroke.

The first pattern 3020 of staple cavities 3010 extends between the proximal axis PA and the distal axis DA. Moreover, at least one staple cavity 3010 in the first pattern 3020 overlaps the proximal axis PA and the distal axis DA. In other instances, more than one longitudinally-repetitive pattern of staple cavities 3010 can be positioned between the proximal axis PA and the distal axis DA. The proximal pattern 3022 is positioned proximal to the proximal axis PA, and the distal pattern 3024 is positioned distal to the distal axis DA. In such instances, staples fired from the distal staple cavities 3010 e-3010 h are not configured to staple incised tissue. Moreover, staples fired from the proximal staple cavities 3010 a-3010 d are not configured to staple the target tissue. Accordingly, such staples may not impact the flexibility and/or sealing quality of the resultant staple line.

In certain instances, it can be desirable to generate a staple line having a first flexibility adjacent to the cutline and a different flexibility proximal to and/or distal to the cutline. For example, a staple line that includes at least two parallel staples on each side of the cutline and positioned distal to the distal end of the cutline, may provide certain advantages. In certain instances, a staple arrangement that provides less flexibility may prevent and/or limit the propagation of the cutline and/or tearing of the tissue. Additionally, the tissue adjacent to an uncut portion may experience less stress and/or strain than the tissue adjacent to the cutline and, thus, may require less flexibility to prevent and/or limit tissue trauma. More specifically, tissue adjacent to the cutline may experience more forces during the cutting stroke and, thus, increased flexibility may prevent trauma to the tissue. Additionally, the tissue adjacent to the cutline may stretch as it heals and thus, increased flexibility may facilitate the healing process. For tissue that experiences fewer forces, such as the tissue distal to the cutline, for example, the reduced flexibility may reinforce or strengthen the staple line and prevent distal propagation of the cutline.

In the depicted arrangement, the proximal pattern 3022 includes two irregular staple cavities on each side of the knife slot 3004 adjacent to the proximal end of the first pattern 3020 and the distal pattern 3024 includes two irregular staple cavities on each side of the knife slot 3004 adjacent to the distal end of the first pattern 3020. In other instances, the proximal pattern 3022 and/or the distal pattern 3024 can consist of a single irregular staple cavity on one or both sides of the knife slot 3004. In still other instances, the proximal pattern 3022 and/or the distal pattern 3024 can include three or more irregular staple cavities on one or both sides of the knife slot 3004. The proximal pattern 3022 and/or the distal pattern 3024 can include longitudinally repetitive sub-patterns. For example, the proximal pattern 3022 and/or the distal pattern 3024 can include multiple columns of parallel staple cavity openings 3012. In certain instances, the staple cartridge body 3000 can have a single irregular pattern, which can be positioned at either the proximal end or distal end of the first pattern 3020.

In certain instances, one or more staple cavities in the proximal pattern 3022 and/or the distal pattern 3024 can be non-parallel to the knife slot 3004. For example, such staple cavities can be oriented perpendicular to the knife slot 3004 or at an oblique angle relative to the knife slot 3004. Additionally or alternatively, certain staple cavities in the proximal pattern 3022 and/or the distal pattern 3024 can be non-parallel to each other

Referring primarily to FIG. 57 , staple drivers 3060 are positioned in the staple cavities 3010 of the cartridge body 3000. The staple drivers 3060 are positioned to support the staples 3042 (FIGS. 58 and 59 ) therein and to drive the staples 3042 from the staple cavities 3010 during a firing stroke. Owing to the different patterns of staple cavities 3010 in the cartridge body 3000, e.g., the patterns 3020, 3022 and 3024, the staple drivers 3060 can have different geometries and/or orientations. For example, the staple drivers 3060 positioned in the staple cavities 3010 of the first pattern 3020 may include connected drivers as described in U.S. patent application Ser. No. 14/498,145, filed Sep. 26, 2014, now U.S. Patent Application Publication No. 2016/0089142, entitled METHOD FOR CREATING A FLEXIBLE STAPLE LINE, which is incorporated by reference herein in its entirety. Each connected driver can include an inner driver positioned in a staple cavity 3010 in the inner row 3014 a, an intermediate driver positioned in a staple cavity 3010 in the intermediate row 3014 b, and an outer driver positioned in a staple cavity 3010 in the outer row 3014 c. A connecting flange can connect the intermediate driver to at least one inner driver and at least one outer driver. In other instances, the staple drivers positioned in the staple cavities in the first pattern 3020 may include individual drivers, wherein each driver drives a single staple. In still other instances, the staples can be direct-drive staples, which can be driven by direct contact with a wedge sled and/or camming surfaces, as described in U.S. patent application Ser. No. 14/138,475, filed on Dec. 23, 2013, now U.S. Patent Application Publication No. 2015/0173749, entitled SURGICAL STAPLES AND STAPLE CARTRIDGES and U.S. patent application Ser. No. 14/498,145, which are incorporated by reference herein in their respective entireties.

The drivers 3060 positioned in the staple cavities 3010 are dimensioned and positioned for driving engagement by the sled and camming surfaces thereof. For example, the drivers 3060 are positioned in the staple cavities 3010 of the first pattern 3020. Proximal drivers 3060 a, 3060 b, 3060 c, and 3060 d are positioned in the staple cavities 3010 a, 3010 b, 3010 c, and 3010 d, respectively, of the proximal pattern 3022, and distal drivers 3060 e, 3060 f, 3060 g, and 3060 h are positioned in the staple cavities 3010 e, 3010 f, 3010 g, and 3010 h, respectively, of the distal pattern 3024. Referring again to FIG. 4 , the sled assembly 1120 and the wedge-shaped cams 1122 thereof can be configured to lift the drivers 3060 in the staple cavities 3010. In such instances, the cams 1122 are configured to drivingly engage the drivers 3060 along the length of the cartridge body 3000. More specifically, the cams 1122 initially engage and drive the proximal drivers 3060 a, 3060 b, 3060 c, and 3060 d to fire the staples in the proximal pattern 3022, then engage and drive the drivers 3060 to fire the staples in the first pattern 3022, and finally engage and drive the distal drivers 3060 e, 3060 f, 3060 g, and 3060 h to fire the staples in the distal pattern 3024. Although the proximal drivers 3060 a, 3060 b, 3060 c, and 3060 d and/or the distal drivers 3060 e, 3060 f, 3060 g, and 3060 h have a different geometry than the drivers 3060 in the first pattern 3020 of staple cavities 3010, the sled and camming surfaces thereof are compatible with the different drivers in the cartridge body 3000.

Referring again to FIG. 4 , the sled assembly 1120 includes four camming surfaces 1122. A first pair of camming surfaces 1122 are positioned for driving engagement with the staple drivers on the first side of the longitudinal axis LA, and a second pair of camming surfaces 1122 are positioned for driving engagement with the staple drivers on the second side of the longitudinal axis LA. The camming surfaces 1122 in each pair are longitudinally offset. In other instances, the camming surfaces 1122 can be longitudinally aligned. Each pair of camming surfaces 1122 is configured to lift a triple driver (see, e.g., the driver 1170 in FIGS. 33A-33C), i.e., a connected driver supporting a staple in the inner row 3014 a of staple cavities 3010, a staple in the intermediate row 3014 b of staple cavities 3010, and a staple in the outer row 3014 c of staple cavities 3010. The camming surfaces 1122 are also configured to lift the proximal drivers 3060 a, 3060 b, 3060 c, and 3060 d and the distal drivers 3060 e, 3060 f, 3060 g, and 3060 h. In other instances, the sled assembly 1120 can include more than or less than four camming surfaces.

The proximal drivers 3060 a-3060 d and the distal drivers 3060 e-3060 h are connected drivers 3058. An exemplary connected driver 3058 is depicted in FIGS. 62-65 . The connected driver 3058 includes the first driver 3060 a and the second driver 3060 b. A connecting flange 3068 extends between the two drivers 3060 a and 3060 b. Because the first and second drivers 3060 a and 3060 b are connected, the staples supported by the first and second drivers 3060 a, 3060 b are fired simultaneously by the sled assembly. Each driver 3060 a and 3060 b also includes a cradle 3070 for supporting the base of the staple. A guide 3062 a and 3062 b extends laterally from each driver 3060 a and 3060 b, respectively. The first guide 3062 a extends in a first direction and forms an outside portion of the connected driver 3058 and the second guide 3062 b extends in a second, opposite direction and forms an inside portion of the connected driver 3058. Ramped surfaces 3064 a and 3064 b on the guides 3062 a and 3062 b, respectively, are positioned for driving contact with the camming surfaces of the sled assembly. The guides 3062 a and 3062 b are driven upward in the channels 3036 (FIG. 55 ) of the cartridge body 3000 when moved to a fired position by the sled assembly. The channels 3036 form a vertical support structure through which the guides 3062 a, 3062 b are driven by the camming surfaces. As described herein, the camming surfaces can be longitudinally offset. In such instances, the ramped surfaces 3064 a, 3064 b are correspondingly offset, as depicted in FIGS. 63 and 65 . In other instances, the ramped surfaces 3064 a and 3064 b can be aligned.

In other instances, the proximal drivers and/or the distal drivers in a staple cartridge may not be connected. For example, referring to FIG. 61 , a staple cartridge 4800 is depicted. The staple cartridge body 4800 is similar in many aspects to the staple cartridge body 3000. For example, the staple cartridge body 4800 includes a first pattern 4820 of angularly-oriented staple cavities, which are arranged in a herringbone pattern. A slot 4804 extends along the longitudinal axis LA of the cartridge body 4800. The staple cartridge body 4800 also includes proximal staple cavities arranged in a proximal pattern 4822 and distal staple cavities arranged in a distal pattern 4824. The proximal pattern 4822 includes a first pair of parallel, longitudinally-aligned staple cavities on a first side of the slot 4804 and a second pair of parallel, longitudinally-aligned staple cavities on a second side of the longitudinal slot 4804. The distal pattern 4824 also includes a first pair of parallel, longitudinally-aligned staple cavities on the first side of the slot 4804 and a second pair of parallel, longitudinally-offset staple cavities on the second side of the longitudinal slot 4804. The proximal pattern 4822 and the distal pattern 4824 are symmetric relative to the longitudinal axis LA. In other instances, the proximal pattern 4822 and/or the distal pattern 4824 can be asymmetric relative to the longitudinal axis LA.

Drivers 4860 are positioned in the staple cavities 4810 of the first pattern 4820. The drivers 4860 in the staple cavities 4810 of the first pattern 4820 are triple drivers, as described herein. Proximal drivers 4860 a, 4860 b, 4860 c, and 4860 d are positioned in the staple cavities of the proximal pattern 4822, and distal drivers 4860 e, 4860 f, 4860 g, and 4860 h are positioned in the staple cavities of the distal pattern 4824. The proximal drivers 4860 a-4860 d and the distal drivers 4860 e-4860 h are single drivers. Exemplary single drivers 4860 a and 4860 b are depicted in FIGS. 66 and 67 .

Each driver 4860 a and 4860 b includes a cradle 4870 for supporting the base of the staple. A guide 4862 a and 4862 b extends laterally from each driver 4860 a and 4860 b, respectively. The first guide 4862 a extends in a first direction and forms an outside portion of the first driver 4860 a and the second guide 4862 b extends in a second, opposite direction and forms an outside portion of the second driver 4860 b. Ramped surfaces 4864 a and 4864 b on the guides 4862 a and 4862 b, respectively, are positioned for driving contact with the camming surfaces of a sled assembly. The guides 4862 a and 4862 b are driven upward in channels in the cartridge body 4800, such as the channels 3036 in the cartridge 3000 (FIG. 55 ), when the drivers 4860 a and 4860 b are moved to a fired position by the sled assembly. The channels form a vertical support structure through which the guides 4862 a and 4862 b are driven by the camming surfaces. Such channels can stabilize the guides 4862 a and 4862 b and, thus, stabilize the individual drivers 4860 a and 4860 b, respectively, during deployment. As described herein, the camming surfaces can be longitudinally offset. In such instances, the ramped surfaces 4864 a, 4864 b are correspondingly offset, as depicted in FIG. 67 . In other instances, the ramped surfaces 4864 a and 4864 b can be aligned.

Because the first and second drivers 4860 a, 4860 b are separate, the staples supported by the first and second drivers 4860 a, 4860 b can be fired independently. In certain instances, the first driver 4860 a and the second driver 4860 b can be fired sequentially. It can be advantageous to fire an inner staple before an outer staple, for example, which can be accomplished with the separate drivers 4860 a and 4860 b. In other instances, an outer staple can be fired before an inner staple with the separate drivers 4860 a and 4860 b. The firing order can be modified by adjusting the relationship between the camming surfaces and the ramped surfaces 3864 a and 4864 b, for example.

In various instances, the staple cavities in a distal pattern and/or a proximal pattern may not be longitudinally-aligned and/or may not be parallel. For example, referring now to FIGS. 68 and 69 , a staple cartridge body 4600 is depicted. The staple cartridge body 4600 is similar in many aspects to the staple cartridge body 3000. For example, the staple cartridge body 4600 includes a first pattern 4620 of angularly-oriented staple cavities 4610, which are arranged in a herringbone pattern. A slot 4604 extends through a deck 4602 of the staple cartridge body 4600 along the longitudinal axis LA of the cartridge body 4600. The staple cartridge body 4600 also includes proximal staple cavities 4610 a-4610 d arranged in a proximal pattern 4622 and distal staple cavities 4610 e-4610 h arranged in a distal pattern 4624. The proximal pattern 4622 includes a first pair of parallel, longitudinally-offset staple cavities 4610 a, 4610 b on a first side of the slot 4604 and a second pair of parallel, longitudinally-offset staple cavities 4610 c, 4610 d on a second side of the longitudinal slot 4604. The distal pattern 4624 also includes a first pair of parallel, longitudinally-offset staple cavities 4610 e, 4610 f on the first side of the slot 4604 and a second pair of parallel, longitudinally-offset staple cavities 4610 g, 4610 h on the second side of the longitudinal slot 4604. The proximal pattern 4622 and the distal pattern 4624 are symmetric relative to the longitudinal axis LA. In other instances, the proximal pattern 4622 and the distal pattern 4624 can be asymmetric relative to the longitudinal axis LA.

Connected drivers 4658 are positioned in the proximal and distal staple cavities 4610 a-4610 h. An exemplary connected driver 4658 is depicted in FIGS. 70-73 . The connected driver 4658 includes the first driver 4660 a and the second driver 4660 b. A connecting flange 4668 extends between the two offset drivers 4660 a and 4660 b. Because the drivers 4660 a and 4660 b are connected, the staples supported by the drivers 4660 a, 4660 b are fired simultaneously by the sled assembly. Each driver 4660 a and 4660 b includes a cradle 4670 for supporting the base of the staple. A guide 4662 a and 4662 b extends laterally from each driver 4660 a and 4660 b, respectively. The first guide 4662 a extends in a first direction and forms an outside portion of the connected driver 4658 and the second guide 4662 b extends in a second, opposite direction and forms an inside portion of the connected driver 4658. Ramped surfaces 4664 a and 4664 b on the guides 4662 a and 4662 b, respectively, are positioned for driving contact with the camming surfaces of a sled assembly. The guides 4662 a and 4662 b are driven upward in channels in the cartridge body 4800, such as the channels 3036 in the staple cartridge 3000 (FIG. 55 ), for example, when the drivers 4660 a, 4660 b are moved to a fired position by the sled assembly. The channels form a vertical support structure through which the guides 4662 a, 4662 b are supported as they are driven by the camming surfaces. As described herein, the camming surfaces can be longitudinally offset. In such instances, the ramped surfaces 4664 a, 4664 b are correspondingly offset, as depicted in FIGS. 71 and 73 . In other instances, the ramped surfaces 4664 a and 4664 b can be aligned.

Referring now to FIGS. 74 and 75 , a staple cartridge body 4700 is depicted. The staple cartridge body 4700 is similar in many aspects to the staple cartridge body 3000. For example, the staple cartridge body 4700 includes a first pattern 4720 of angularly-oriented staple cavities 4710, which are arranged in a herringbone pattern. A slot 4704 extends through a deck 4702 of the staple cartridge body 4700 along the longitudinal axis LA of the cartridge body 4700. The staple cartridge body 4700 also includes proximal staple cavities 4710 a-4710 f arranged in a proximal pattern 4722. The proximal pattern 4722 includes inner staple cavities 4710 c and 4710 d, which are oriented parallel to the longitudinal axis LA. The proximal pattern 4722 also includes angularly-oriented outer staple cavities 4710 a and 4710 f, and angularly-oriented intermediate cavities 4710 b and 4710 e. The outer staple cavities 4710 a and 4710 f and the intermediate staple cavities 4710 b and 4710 e are oriented at oblique angles relative to the longitudinal axis LA. The angularly-oriented outer staple cavities 4710 a and 4710 f are also oriented at oblique angles relative to the cavity axes of the staple cavities 4710 in the first pattern 4720. The outer staple cavities 4710 a and 4710 f are less angled than the staple cavities 4710 in the first pattern 4720. In other words, the outer staple cavities 4710 a and 4710 f are oriented at an angle that is closer to parallel with the longitudinal axis LA than the staple cavities 4710 in the first pattern 4720. In such instances, the proximal pattern 4722 can be less flexible than the first pattern 4720.

The intermediate staple cavities 4710 b and 4710 e are oriented parallel to certain staple cavities 4710 in the first pattern 4020. For example, the intermediate staple cavities 4710 b and 4710 e are oriented parallel to the staple cavities 4710 in an inner row in the first pattern 4720. Though certain staple cavities in the proximal pattern 4722 are not angularly offset from the staple cavities in the first pattern 4020, the proximal pattern 4722, when considered as a whole, is different than the first pattern 4020 and is different than the longitudinally-repetitive sub-patterns within the first pattern 4020.

The proximal pattern 4722 includes three staple cavities positioned on each side of the slot 4704. In other instances, less than three staple cavities or more than three staple cavities can be arranged in the proximal pattern 4722 on one or both sides of the slot 4704. The proximal pattern 4722 does not include a longitudinally-repetitive sub-pattern. In other instances, the proximal pattern 4722 can be longitudinally repetitive. Additionally, the proximal pattern 4722 is symmetric relative to the longitudinal axis LA. In other instances, the proximal pattern 4722 can be asymmetric relative to the longitudinal axis LA.

Drivers 4760 are positioned in the staple cavities 4710 in the cartridge body 4700. The drivers 4760 in the staple cavities 4710 of the first pattern 4720 are triple drivers, as described herein. Proximal drivers 4760 a, 4760 b, 4760 c, 4760 d, 4710 e, and 4710 f are positioned in the proximal staple cavities 4710 a, 4710 b, 4710 c, 4710 d, 4710 e, and 4710 f respectively, of the proximal pattern 4722. The proximal drivers 4760 a-4760 f are single drivers. In certain instances, the proximal drivers 4760 c and 4760 d in the inner cavities 4710 c and 4710 d, respectively, can be single drivers, the proximal drivers 4760 a and 4760 b can be connected drivers, and the proximal drivers 4760 e and 4760 f can be connected drivers. In still other instances, the proximal drivers 4760 a, 4760 b, and 4760 c can comprise a first connected driver, and the distal drivers 4760 d, 4760 e, and 4760 f can comprise a second connected driver.

The reader will appreciate that the various patterns of staple cavities described herein can be combined and/or interchanged. In certain instances, one or more irregular patterns of staple cavities can be defined at the proximal and/or distal end of a staple cartridge body. Additionally or alternatively, one or more irregular patterns, or minor patterns, can be sandwiched or inserted within a major pattern.

The angular orientation of staples in a staple line can influence the flexibility or compliance of the stapled tissue along the staple line. For example, the flexibility of a staple line can increase when staples are oriented at an oblique angle relative to the longitudinal axis and/or cutline. Such an angular orientation can provide flexibility or extendibility, within certain limits, in response to forces, such as tension and/or torsion, along and/or adjacent to the cutline. More specifically, the flexibility in the staple line can permit stretching, buckling, folding, and/or twisting of the stapled tissue. Generally, as the angular orientation of a staple approaches 45 degrees or 135 degrees relative to the longitudinal axis of the staple line and/or the cutline, the flexibility of the stapled tissue increases. A staple line comprised of angularly-oriented staples can be considered a compliant or elastic staple line, for example.

In certain instances, the flexibility of a staple line can vary laterally relative to the cutline. For example, one or more staples in a first portion of the staple line can be oriented at a first angle relative to the cutline and one or more staples in a second portion of the staple line can be oriented at a different angle relative to the cutline. The first portion of the staple line can have a first flexibility and the second portion of the staple line can have a different flexibility. In certain instances, the first portion can be laterally offset from the second portion. For example, the first portion of the staple line can include a first row of staples or portion of the first row, and the second portion of the staple line can include a second row of staples or portion of the second row. In such instances, the flexibility of the staple line along the first row of staples can be different than the flexibility of the staple line along the second row of staples.

Referring now to FIG. 76 , a portion of a staple cartridge body 3200 is depicted. The staple cartridge body 3200 includes a deck 3202 and a longitudinal slot 3204. The longitudinal slot 3204 extends along the longitudinal axis LA. Staple cavities 3210 are defined in the staple cartridge body 3200, and each staple cavity 3210 defines an opening 3212 in the deck 3202. A staple 3242 is positioned in each staple cavity 3210. The staple 3242 can be similar in many aspects to the staple 3042 (FIG. 59 ) or the staple 3142 (FIG. 60 ). In certain instances, the legs of each staple 3242 can be biased against the inside wall of the staple cavity 3210. The reader will appreciate that the arrangement of staples 3242 in the staple cavities 3210 corresponds to the arrangement of staples 3242 in a staple line when the staples 3242 are fired from the staple cartridge body 3200 and into tissue. More specifically, the bases of each staple 3242 in a resultant staple line are collinear, or substantially collinear, with the cavities axes CA.

The staple cavity openings 3212 are arranged in three rows 3214 a, 3214 b, and 3214 c on a first side of the longitudinal slot 3204. Inner openings 3212 a define the perimeter of inner cavities 3210 a in the inner row 3214 a, intermediate openings 3212 b define the perimeter of intermediate cavities 3210 b in the intermediate row 3214 b, and outer openings 3212 c define the perimeter of outer cavities 3210 c in the outer row 3214 c. Inner staples 3242 a are positioned in the inner cavities 3210 a, intermediate staples 3242 b are positioned in the intermediate cavities 3210 b, and outer staples 3242 c are positioned in the outer cavities 3210 c. Although not shown in FIG. 76 , in at least one instance, the staple cavities 3210 on the opposing side of the slot 3204 form a mirror image reflection of the staple cavities 3210 on the first side of the longitudinal slot 3204. Consequently, the arrangement of staples 3242 in a resultant staple line is symmetric relative to the cutline. In other instances, the staple line can be asymmetric relative to the cutline.

Each staple cavity opening 3212 has a first end, or proximal end, 3216 and a second end, or distal end, 3218. A cavity axis CA extends between the proximal end 3216 and the distal end 3218 of each opening 3212. The staple cavity openings 3212 in each respective row are parallel. For example, the inner cavities 3210 a are oriented at an angle A relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(A1) and CA_(A2)) of the inner openings 3212 a are oriented at the angle A relative to the longitudinal axis LA. The intermediate cavities 3210 b are oriented at an angle B relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(B1) and CA_(B2)) of the intermediate openings 3212 b are oriented at the angle B relative to the longitudinal axis LA. The outer cavities 3210 c are oriented at an angle C relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(C1) and CA_(C2)) defined by the outer openings 3212 are oriented at the angle C relative to the longitudinal axis LA.

The angles A, B, and C are different. Consequently, the inner openings 3212 a are obliquely oriented relative to the outer openings 3212 c. Because the cavity axes CA of the outer openings 3212 c (e.g., axes CA_(C1) and CA_(C2)) are not parallel to the cavity axes of the inner openings 3212 a (e.g., axes CA_(A1) and CA_(A2)), the openings 3212 in the staple cartridge body 3200 form a modified or skewed herringbone pattern. The cavity axes CA_(B1) and CA_(B2) of the intermediate openings 3212 b can be oriented perpendicular, or substantially perpendicular, to either the inner openings 3212 a or the outer openings 3212 c. For example, the angle B can be a supplementary angle to either angle A or angle C. In other instances, the angle B may not be a supplementary angle to either angle A or angle C.

Owing to the different angles A, B, and C, the widths W_(A), W_(B), W_(C) of the staple rows in the staple line can be different. For example, the inner staples 3242 a form a row of staples having a width W_(A), the intermediate staples 3242 b form a row of staples having a width W_(B), and the outer staples 3242 c form a row of staples having a width W_(C). The widths W_(A) and W_(C) are different because the angle A is different than the angle C. In certain instances, the width W_(B) is different than the widths W_(A) and W_(C). In other instances, the width W_(B) can match one of the widths W_(A) or W_(C). For example, if the angle B is a supplementary angle to angle A, the width W_(B) matches the width W_(A). Similarly, if the angle B is a supplementary angle to angle C, the width W_(B) matches the width W_(C).

Furthermore, owing to the different angles A, B, and C, the longitudinal lengths L_(A), L_(B), and L_(C) of the staples 3242 a, 3242 b, and 3242 c, respectively, are different. For example, the inner staples 3242 a have a longitudinal length L_(A), the intermediate staples 3242 b have a longitudinal length L_(B), and the outer staples 3242 c have a longitudinal length L_(C). The longitudinal lengths L_(A) and L_(C) are different because the angle A is different than the angle C. Because the longitudinal lengths L_(A) and L_(C) are different, the inner staples 3242 a are at least partially longitudinally staggered or offset relative to the outer staples 3242 c. Stated differently, at least one end of each inner staple 3242 a is not aligned with a corresponding end of an outer staple 3242 b. Because the ends are not aligned, the longitudinal overlap and/or gap with respect to the intermediate staples 3242 b differs between the inner staples 3242 a and the outer staples 3242 c. In certain instances, the longitudinal length L_(B) is different than the lengths L_(A) and L_(C). In other instances, the longitudinal length L_(B) can match one of the longitudinal lengths L_(A) or L_(C). For example, if the angle B is a supplementary angle to angle A, the longitudinal length L_(B) matches the longitudinal length L_(A). Similarly, if the angle B is a supplementary angle to angle C, the longitudinal length L_(B) matches the longitudinal length L_(C).

The length of the staple bases may also impact the widths W_(A), W_(B), and W_(C) and the longitudinal lengths L_(A), L_(B), and L_(C). In the staple cartridge body 3200, the inner staples 3242 a, the intermediate staples 3242 b, and the outer staples 3242 c have the same length base. For example, identical staples can be positioned in each staple cavity 3210. In other instances, as further described herein, staples having different geometries and/or sizes, such as bases of different lengths, for example, can be positioned in certain staple cavities in a cartridge body.

Referring still to FIG. 76 , the angular orientation of the staple cavities 3210 a, 3210 b, and 3210 c, and the corresponding widths W_(A), W_(B), and W_(C) and longitudinal lengths L_(A), L_(B), and L_(C), respectively, can impact the amount of lateral and longitudinal overlap in the staple line. The longitudinal and lateral overlap between the staples 3242 also depends on the spacing of the staple cavities 3210. Generally, a greater overlap between adjacent staples corresponds to less direct fluid pathways, which can correspond to greater tissue sealing properties. A greater overlap can also decrease the flexibility of the staple line because the tissue may be more constrained in the overlapped region. Moreover, a greater overlap can correspond to less spacing between the staples. In certain instances, it can be desirable to modify the degree of lateral and/or longitudinal overlap in a staple line. As the overlap varies, the flexibility and sealing properties of the staple line can also vary.

The overlap or degree of overlap described herein can refer to a positive overlap or a negative overlap, for example. When staples and/or rows of staples define a negative overlap, the staples and/or rows of staples may be spaced apart such that they do not overlap and a gap is defined therebetween. In still other instances, the staples or rows of staples can be aligned such that the overlap is equal to the diameter of the staples.

The reader will further appreciate that the degree of overlap with respect to the staples or rows of staples in a staple cartridge corresponds to the degree of overlap with respect to the staple cavities or rows of staple cavities in the staple cartridge. For example, relative differences in the lateral and/or longitudinal overlaps between staples or rows of staples correspond to the relative differences in the lateral and/or longitudinal overlaps in the staple cavities or rows of staple cavities in the staple cartridge. In certain instances, at least a portion of the staple legs can be positioned against and/or biased into the inside walls of the staple cavities at the proximal and distal ends of the staple cavity. In such instances, a distance measured with respect to the outside edges of the staples equal the distance measured with respect to the inside edges of the corresponding staple cavities. In other instances, the difference between such distances can be minimal or insignificant.

In certain instances, the degree of overlap can be minimized, such as when ends of the staples are aligned. When the ends of the staples are aligned, the overlap is equal, or substantially equal, to the diameter of the staples. For example, if the staples are comprised of a wire having a diameter of about 0.0079 inches, the overlap can be about 0.0079 inches. In other instances, the overlap can be less than the diameter of staples. For example, the overlap can be less than about 0.0079 inches. In still other instances, the degree of overlap can be a non-overlap or negative overlap, i.e., a space or gap between the ends of the staples. In still other instances, a minimized overlap can be equal to or less than one-third of the staple length. For example, the overlap can be less 33% of the staple length. In other instances, the overlap can be less than 25% or less than 10% of the staple length. In still other instances, the overlap can be more than 33% of the staple length, for example.

In certain instances, a staple line can include a first degree of overlap between the inner and intermediate rows of staples and a second degree of overlap between the intermediate and outer rows of staples. The second degree of overlap can be different from the first degree of overlap in a lateral and/or longitudinal direction. Consequently, an inner portion of the staple line can comprise a different flexibility than an outer portion of the staple line. Moreover, the tissue sealing properties of the inner portion can be different than the tissue sealing properties of the outer portion.

Referring again to FIG. 76 , the angle A is less than the angle C. Consequently, the width W_(A) is less than the width W_(C) and the length L_(A) is greater than the length L_(C). The angle A can be 35 degrees to 40 degrees, for example, and the angle C can be 43 degrees to 47 degrees, for example. In other instances, the angle A can be less than 35 degrees or more than 40 degrees and/or the angle C can be less than 43 degrees or more than 47 degrees. The difference between the angle A and the angle C can be between three degrees and twelve degrees. For example, the difference can be about eight degrees. In still other instances, the difference between the angle A and the angle C can be less than three degrees or more than twelve degrees.

Referring still to FIG. 76 , the staples 3242 in each respective row are aligned. More specifically, the proximal ends of the inner staples 3242 a are longitudinally aligned, the distal ends of the inner staples 3242 a are longitudinally aligned, the proximal ends of the intermediate staples 3242 b are longitudinally aligned, the distal ends of the intermediate staples 3242 b are longitudinally aligned, the proximal ends of the outer staples 3242 c are longitudinally aligned, and the distal ends of the outer staples 3242 c are longitudinally aligned. The aligned staples 3242 in each row 3214 a, 3214 b, and 3214 c of staple cavities 3310 are configured to form rows of aligned staples 3242 in a staple line. Owing to the angular orientation of the staples 3242 and the spacing therebetween, the rows of staples 3242 laterally overlap. The inner staples 3242 a laterally overlap the intermediate staples 3242 b by a lateral overlap Y_(A/B) and the outer staples 3242 c laterally overlap the intermediate staples 3242 b by a lateral overlap Y_(B/C). The lateral overlap Y_(A/B) between the inner staples 3242 a and the intermediate staples 3242 b is greater than the lateral overlap Y_(B/C) between the outer staples 3242 c and the intermediate staples 3242 b. In such instances, the outer staples are positioned closer to the intermediate staples than the inner staples are positioned to the intermediate staples. In other instances, the lateral overlap Y_(A/B) can be less than or equal to the lateral overlap Y_(B/C).

The intermediate staples 3242 b are longitudinally staggered with respect to the inner staples 3242 a and the outer staples 3242 c. In particular, each intermediate staple 3242 b is positioned longitudinally equidistant between adjacent inner staples 3242 a and longitudinally equidistant between adjacent outer staples 3242 c. Owing to the angular orientation of the staples 3242 and the spacing therebetween, the staples 3242 do not longitudinally overlap. The inner staples 3242 a are spaced apart from the intermediate staples 3242 b by a longitudinal gap X_(A/B) and the outer staples 3242 c are spaced apart from the intermediate staples 3242 b by a longitudinal gap X_(B/C). The longitudinal gap X_(A/B) between the inner staples 3242 a and the intermediate staples 3242 b is less than the longitudinal gap X_(B/C) between the outer staples 3242 c and the intermediate staples 3242 b. In other instances, the longitudinal gap X_(A/B) can be greater than or equal to the longitudinal gap X_(B/C). In certain instances, the intermediate staples 3242 b can longitudinally overlap the inner staples 3242 a and/or the outer staples 3242 c.

The lateral overlaps and longitudinal gaps generated by the arrangement of staple cavities in FIG. 76 can be sufficient to sufficiently obstruct the fluid pathways across the staple line to seal the tissue. In various instances, the lateral and/or longitudinal overlaps and/or gaps can be configured to selectively optimize the sealing properties of the staple line. Additionally or alternatively, the lateral and/or longitudinal overlaps and/or gaps can be configured to selectively optimize the flexibility of the staple line. Moreover, the overlaps can be minimized. In certain instances, the lateral overlaps can be less than one-third of the staple length and, in at least one instance, can equal approximately the diameter of the staple.

Referring now to FIG. 77 , a portion of a staple cartridge body 3300 is depicted. The staple cartridge body 3300 includes a deck 3302 and a longitudinal slot 3304. The longitudinal slot 3304 extends along the longitudinal axis LA. Staple cavities 3310 are defined in the staple cartridge body 3300, and each staple cavity 3310 includes an opening 3312 in the deck 3302. A staple 3342 is positioned in each staple cavity 3310. The staple 3342 can be similar in many aspects to the staple 3042 (FIG. 59 ) or the staple 3142 (FIG. 60 ). In certain instances, the legs of each staple 3342 can be biased against the inside wall of the staple cavity 3310. The reader will appreciate that the arrangement of staples 3342 in the staple cavities 3310 corresponds to the arrangement of staples 3342 in a staple line when the staples 3342 are fired from the staple cartridge body 3300 and into tissue. More specifically, the bases of each staple 3342 in a resultant staple line are collinear, or substantially collinear, with the cavities axes CA.

The staple cavity openings 3312 are arranged in three rows 3314 a, 3314 b, and 3314 c on a first side of the longitudinal slot 3304. Inner openings 3312 a define the perimeter of inner cavities 3310 a in the inner row 3314 a, intermediate openings 3312 b define the perimeter of intermediate cavities 3310 b in the intermediate row 3314 b, and outer openings 3312 c define the perimeter of outer cavities 3310 c in the outer row 3314 c. Inner staples 3342 a are positioned in the inner cavities 3310 a, intermediate staples 3342 b are positioned in the intermediate cavities 3310 b, and outer staples 3342 c are positioned in the outer cavities 3310 c. Although not shown in FIG. 77 , in at least one instance, the staple cavities 3310 on the opposing side of the slot 3304 form a mirror image reflection of the staple cavities 3310 on the first side of the longitudinal slot 3304. Consequently, the arrangement of staples 3342 in a resultant staple line is symmetric relative to the cutline. In other instances, the staple line can be asymmetric relative to the cutline.

Each staple cavity opening 3312 has a first end, or proximal end, 3316 and a second end, or distal end, 3318. A cavity axis CA extends between the proximal end 3316 and the distal end 3318 of each opening 3312. The staple cavity openings 3312 in each respective row are parallel. For example, the inner cavities 3310 a are oriented at an angle A relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(A)) of the inner openings 3312 a are oriented at the angle A relative to the longitudinal axis LA. The intermediate cavities 3310 b are oriented at an angle B relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(B)) of the intermediate openings 3312 b are oriented at the angle B relative to the longitudinal axis LA. The outer cavities 3310 c are oriented at an angle C relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(C)) defined by the outer openings 3312 c are oriented at the angle C relative to the longitudinal axis LA.

In the staple cartridge body 3300, the angle A is equal to the angle C, and the angle B is a supplementary angle to the angles A and C. Consequently, the inner openings 3312 a are parallel to outer openings 3312 c and the intermediate openings 3312 b are perpendicular to the inner and outer openings 3312 a and 3312 c, respectively. The staple cavity openings 3312 in the staple cartridge body 3300 form a herringbone pattern. Moreover, referring still to FIG. 77 , the staples 3342 in each row 3314 a, 3314 b, 3314 c have the same length base BL. The widths of the staple rows are equal, and the longitudinal lengths of the staples 3342 are also equal.

Referring still to FIG. 77 , the longitudinal overlap X_(A/B) between the inner staples 3342 a and the intermediate staples 3342 b is equal to the longitudinal overlap X_(B/C) between the outer staples 3342 c and the intermediate staples 3342 b. Moreover, the lateral overlap Y_(A/B) between the inner staples 3342 a and the intermediate staples 3342 b is equal to the lateral overlap Y_(B/C) between the outer staples 3342 c and the intermediate staples 3342 b. In such instances, the intermediate staples 3342 b are positioned equidistantly close to the inner staples 3342 a and the outer staples 3342 c.

Referring still to FIG. 77 , the spacing between the staple cavities 3310 in the cartridge body 3300 is minimized. For example, the proximal and distal ends 3316, 3318 of the staple cavity openings 3312 are positioned adjacent to other staple cavities 3312. In certain instances, adjacent staple cavities can be in abutting contact. By minimizing the spacing between the staple cavities 3310, the density of the staple cavities 3310 and the degree of overlap between the staple cavities 3310 in the arrangement of FIG. 77 is maximized. Although the degree of overlap is maximized, because of the close proximity of the staple cavities, the lateral overlap is still less than one-third of the staple length.

In other instances, the angular orientation of the staple cavities in at least one row of staple cavities can differ from the angular orientation of the staple cavities in other rows. Additionally or alternatively, the length of the staple bases in at least one row of staple cavities can differ from the length of the staple bases in at least one other row. Additionally or alternatively, the staple cavities may not be equidistantly staggered or offset from adjacent staple cavities in each adjacent row. Such variations to the staple cartridge and staples therein can generate staple lines with varying properties laterally with respect to the cutline.

In certain instances, the staples in an inner portion of the staple line, such as the staples fired from the inner rows of staple cavities, for example, can have a different base length than the staples in an outer portion of the staple line. For example, the staples in the inner row of staple cavities on each side of a knife slot can have a longer base than the staples in the other rows of staple cavities. The longer bases can provide greater sealing capabilities because more tissue can be captured by the staples, for example. Additionally or alternatively, the longer bases can reinforce the staple line and reduce the flexibility thereof.

Referring now to FIG. 78 , a portion of a staple cartridge body 3400 is depicted. The staple cartridge body 3400 includes a deck 3402 and a longitudinal slot 3404. The longitudinal slot 3404 extends along the longitudinal axis LA. Staple cavities 3410 are defined in the staple cartridge body 3400, and each staple cavity 3410 defines an opening 3412 in the deck 3402. A staple 3442 is positioned in each staple cavity 3410. The staple 3442 can be similar in many aspects to the staple 3042 (FIG. 59 ) or the staple 3142 (FIG. 60 ). In certain instances, the legs of each staple 3442 can be biased against the inside wall of the staple cavity 3410. The reader will appreciate that the arrangement of staples 3442 in the staple cavities 3410 corresponds to the arrangement of staples 3442 in a staple line when the staples 3442 are fired from the cartridge body 3400 and into tissue. More specifically, the bases of each staple 3442 in a resultant staple line are collinear, or substantially collinear, with the cavities axes CA.

The staple cavity openings 3412 are arranged in three rows 3414 a, 3414 b, and 3414 c on a first side of the longitudinal slot 3404. Inner openings 3412 a define the perimeter of inner cavities 3410 a in the inner row 3414 a, intermediate openings 3412 b define the perimeter of intermediate cavities 3410 b in the intermediate row 3414 b, and outer openings 3412 c define the perimeter of outer cavities 3410 c in the outer row 3414 c. Inner staples 3442 a are positioned in the inner cavities 3410 a, intermediate staples 3442 b are positioned in the intermediate cavities 3410 b, and outer staples 3442 c are positioned in the outer cavities 3410 c. Although not shown in FIG. 78 , in at least one instance, the staple cavities 3410 on the opposing side of the slot 3404 form a mirror image reflection of the staple cavities 3410 on the first side of the longitudinal slot 3404. Consequently, the arrangement of staples 3442 in a resultant staple line is symmetric relative to the cutline. In other instances, the staple line can be asymmetric relative to the cutline.

Each staple cavity opening 3412 has a first end, or proximal end, 3416 and a second end, or distal end, 3418. A cavity axis CA extends between the proximal end 3416 and the distal end 3418 of each opening 3412. The staple cavity openings 3412 in each row are parallel. For example, the inner cavities 3410 a are oriented at an angle A relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(A)) of the inner openings 3412 a are oriented at the angle A relative to the longitudinal axis LA. The intermediate cavities 3410 b are oriented at an angle B relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(B)) of the intermediate openings 3412 b are oriented at the angle B relative to the longitudinal axis LA. The outer cavities 3410 c are oriented at an angle C relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(C)) defined by the outer openings 3412 c are oriented at the angle C relative to the longitudinal axis LA.

The angles A, B, and C are different. The inner openings 3412 a are obliquely oriented relative to the outer openings 3412 c. The angle A is less than the angle C. Because the axes of outer openings 3412 c (e.g., axis CA_(C)) are not parallel to the axes of inner openings 3412 a (e.g., axis CA_(A)), the staple cavity openings 3412 in the staple cartridge body 3400 form a modified or skewed herringbone pattern. The cavity axes CA_(B) of the intermediate openings 3412 b can be oriented perpendicular, or substantially perpendicular, to either the inner openings 3412 a or the outer openings 3412 c. For example, the angle B can be a supplementary angle to either angle A or C. In other instances, the angle B may not be a supplementary angle to either angle A or C.

Referring still to FIG. 78 , the inner staples 3442 a have a base length BL_(A), the intermediate staples 3442 b have a base length BL_(B), and the outer staples 3442 c have a base length BL_(C). The base length BL_(A) is greater than the base length BL_(B) and the base length BL_(C). In other words, the inner staples 3442 a are longer than the intermediate staples 3442 b and the outer staples 3442 c. Moreover, the staple cavities 3410 housing the inner staples 3442 a are correspondingly larger to accommodate the longer length base BL_(A).

The arrangement of staple cavities 3410 in the cartridge body 3400 provides a longitudinal overlap X_(A/B) between inner staples 3442 a and the intermediate staples 3442 b at both the proximal and distal ends of the intermediate staples 3442 b. The intermediate staples 3442 b are equidistantly spaced and longitudinally staggered between two adjacent inner staples 3442 a. The intermediate staples 3442 b are also equidistantly spaced and longitudinally staggered between two adjacent outer staples 3442 c. The proximal end of each outer staple 3442 c is longitudinally aligned with the distal end of an intermediate staple 3442 b and the distal end of each outer staple 3442 c is longitudinally aligned with the proximal end of another intermediate staple 3442 b. In other words, such staples are longitudinally aligned and the longitudinal overlap is equal to the diameter of the staples 3442. The arrangement of staples cavities 3410 in the cartridge body 3400 also provides a lateral gap Y_(A/B) between the inner row 3414 a and the intermediate row 3414 b and a lateral overlap Y_(B/C) between the outer row 3414 c and the intermediate row 3414 b. In such instances, the intermediate staples 3442 b are positioned closer to the outer staples 3442 c than to the inner staples 3442 a.

Referring still to FIG. 78 , a staple line generated by the staple cartridge body 3400 can have different properties laterally with respect to the cutline. In particular, the staple line may have a greater sealing effectiveness along the cutline than laterally outward from the cutline. Furthermore, the staple line may have a greater flexibility laterally away from the cutline than inward toward the cutline. For example, because the bases BL_(A) of the inner staples 3442 a are longer than the bases BL_(B) and BL_(C) of the intermediate staples 3442 b and the outer staples 3442 c, respectively, an inner portion of the staple line may have greater sealing effectiveness and/or less flexibility than an outer portion of the staple line. Additionally or alternatively, because the inner staples 3442 a are oriented at an angle that is less than the outer staples 3442 c and is closer to a parallel orientation than the outer staples 3442 c, an inner portion of the staple line may have greater sealing effectiveness and/or less flexibility than an outer portion of the staple line. Additionally or alternatively, because the intermediate staples 3442 b longitudinally overlap the inner staples 3442 a but do not longitudinally overlap the outer staples 3442 c, an inner portion of the staple line may have greater sealing effectiveness and/or less flexibility than an outer portion of the staple line. The amount of overlap can be minimized. For example, the overlap can be less than one-third of the staple length and, in at least one instance, can equal approximately the diameter of the staple.

In certain instances, the staples in an outer portion of the staple line, such as the staples fired from the outer rows of staple cavities, for example, can have a different base length than the staples in an inner portion of the staple line. For example, the staples in the outer row of staple cavities on each side of a knife slot can have a shorter base than the staples in the other rows of staple cavities. The shorter bases can provide increased flexibility of the staple line, for example.

Referring now to FIG. 79 , a portion of a staple cartridge body 3500 is depicted. The staple cartridge body 3500 includes a deck 3502 and a longitudinal slot 3504. The longitudinal slot 3504 extends along the longitudinal axis LA. Staple cavities 3510 are defined in the staple cartridge body 3500, and each staple cavity 3510 defines an opening 3512 in the deck 3502. A staple 3542 is positioned in each staple cavity 3510. The staple 3542 can be similar in many aspects to the staple 3042 (FIG. 59 ) or the staple 3142 (FIG. 60 ). In certain instances, the legs of each staple 3542 can be biased against the inside wall of the staple cavity 3510. The reader will appreciate that the arrangement of staples 3542 in the staple cavities 3510 corresponds to the arrangement of staples 3542 in a staple line when the staples 3542 are fired from the cartridge body 3500 and into tissue. More specifically, the bases of each staple 3542 in a resultant staple line are collinear, or substantially collinear, with the cavities axes CA.

The staple cavity openings 3512 are arranged in three rows 3514 a, 3514 b, and 3514 c on a first side of the longitudinal slot 3504. Inner openings 3512 a define the perimeter of inner cavities 3510 a in the inner row 3514 a, intermediate openings 3512 b define the perimeter of intermediate cavities 3510 b in the intermediate row 3514 b, and outer openings 3512 c define the perimeter of outer cavities 3510 c in the outer row 3514 c. Inner staples 3542 a are positioned in the inner cavities 3510 a, intermediate staples 3542 b are positioned in the intermediate cavities 3510 b, and outer staples 3542 c are positioned in the outer cavities 3510 c. Although not shown in FIG. 79 , in at least one instance, the staple cavities 3510 on the opposing side of the slot 3504 form a mirror image reflection of the staple cavities 3510 on the first side of the longitudinal slot 3504. Consequently, the arrangement of staples 3542 in a resultant staple line is symmetric relative to the cutline. In other instances, the staple line can be asymmetric relative to the cutline.

Each staple cavity opening 3512 has a first end, or proximal end, 3516 and a second end, or distal end, 3518. A cavity axis CA extends between the proximal end 3516 and the distal end 3518 of each opening 3512. The staple cavity openings 3512 in each row are parallel. For example, the inner cavities 3510 a are oriented at an angle A relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(A)) of the inner openings 3512 a are oriented at the angle A relative to the longitudinal axis LA. The intermediate cavities 3510 b are oriented at an angle B relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(B)) of the intermediate openings 3512 b are oriented at the angle B relative to the longitudinal axis LA. The outer cavities 3510 c are oriented at an angle C relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(C)) defined by the outer openings 3512 c are oriented at the angle C relative to the longitudinal axis LA.

The angles A, B, and C may be different. The inner openings 3512 a are obliquely oriented relative to the outer openings 3512 c. The angle A is less than the angle C. Because the axes of the outer openings 3512 c (e.g., axis CA_(C)) are not parallel to the axes of the inner openings 3512 a (e.g., axis CA_(A)), the staple cavity openings 3512 in the staple cartridge body 3500 form a modified or skewed herringbone pattern. The cavity axes CA_(B) of the intermediate openings 3512 b can be oriented perpendicular, or substantially perpendicular, to either the inner openings 3512 a or the outer openings 3512 c. For example, the angle B can be a supplementary angle to either angle A or C. In other instances, the angle B may not be a supplementary angle to either angle A or C.

The inner staples 3542 a have a base length BL_(A), the intermediate staples 3542 b have a base length BL_(B), and the outer staples 3542 c have a base length BL_(C). The base length BL_(C) is less than the base length BL_(B) and the base length BL_(A). In other words, the outer staples 3542 c are shorter than the intermediate staples 3542 b and the inner staples 3542 a. Moreover, the staple cavities 3510 housing the outer staples 3542 c are correspondingly shorter to accommodate the shorter length base BL_(C).

The arrangement of staple cavities 3510 in the cartridge body 3500 provides a longitudinal overlap X_(A/B) between the inner staples 3542 a and the intermediate staples 3542 b at both the proximal and distal ends of the intermediate staples 3542 b. The intermediate staples 3542 b are equidistantly spaced and longitudinally staggered between two adjacent inner staples 3542 a. The arrangement of staple cavities 3510 in the cartridge body 3500 also provides a longitudinal overlap X_(B/C) between the intermediate staples 3542 b and the outer staples 3542 c at both the proximal and distal ends of the intermediate staples 3542 b. The intermediate staples 3542 b are also equidistantly spaced and longitudinally staggered between two adjacent outer staples 3542 c. Owing to the angular orientation and spacing of the staples 3542, the longitudinal overlap X_(A/B) is greater than the longitudinal overlap X_(B/C). The arrangement of staples cavities 3510 in the cartridge body 3500 also provides a lateral gap Y_(A/B) between the inner staples 3542 a and the intermediate staples 3542 b and a lateral overlap Y_(B/C) between the outer staples 3542 c and the intermediate staples 3542 b. In such instances, the intermediate staples 3542 b are positioned closer to the outer staples 3542 c than to the inner staples 3542 a.

Referring still to FIG. 79 , a staple line generated by the staple cartridge body 3500 can have different properties laterally with respect to the cutline. In particular, the staple line may have a greater sealing effectiveness along the cutline than laterally outward from the cutline. Furthermore, the staple line may have a greater flexibility laterally away from the cutline than inward toward the cutline. For example, because the bases BL_(C) of the outer staples 3542 c are shorter than the bases BL_(A) and BL_(B) of the intermediate staples 3542 b and the outer staples 3542 c, respectively, an inner portion of the staple line may have greater sealing effectiveness and/or less flexibility than an outer portion of the staple line. Additionally or alternatively, because the inner staples 3542 a are oriented at an angle that is less than the outer staples 3542 c and is closer to a parallel orientation than the outer staples 3542 c, an inner portion of the staple line may have greater sealing effectiveness and/or less flexibility than an outer portion of the staple line. Additionally or alternatively, because the intermediate staples 3542 b longitudinally overlap the inner staples 3542 a more than the intermediate staples 3542 b longitudinally overlap the outer staples 3542 c, an inner portion of the staple line may have greater sealing effectiveness and/or less flexibility than an outer portion of the staple line.

In various instances, the properties of the staple line can be customized in each row of staples. The staples in each row of staple cavities on one side of a knife slot can have different base lengths. Additionally, the staples in each row of staple cavities on one side of a knife slot can be oriented at different angles relative to the knife slot. Moreover, the spacing between the cavities can be varied row-to-row. For example, the size and orientation of the staples in each row can be selected to optimize the flexibility of the staple line and sealing properties in each row based on the row's position laterally from the cutline toward the outer boundary of the staple line. In certain instances, the sealing effectiveness can be maximized or emphasized along the cutline, for example, and the flexibility of the staple line can be maximized or emphasized along the outer boundary of the staple line, for example. Alternatively, in certain instances, the sealing effectiveness can be maximized or emphasized along the outer boundary of the staple line and/or the flexibility of the staple line can be maximized or emphasized along the cutline.

Referring now to FIG. 80 , a portion of a staple cartridge body 3600 is depicted. The staple cartridge body 3600 includes a deck 3602 and a longitudinal slot 3604. The longitudinal slot 3604 extends along the longitudinal axis LA. Staple cavities 3610 are defined in the staple cartridge body 3600, and each staple cavity 3610 defines an opening 3612 in the deck 3602. A staple 3642 is positioned in each staple cavity 3610. The staple 3642 can be similar in many aspects to the staple 3042 (FIG. 59 ) or the staple 3142 (FIG. 60 ). In certain instances, the legs of each staple 3642 can be biased against the inside wall of the staple cavity 3610. The reader will appreciate that the arrangement of staples 3642 in the staple cavities 3610 corresponds to the arrangement of staples 3642 in a staple line when the staples 3642 are fired from the cartridge body 3600 and into tissue. More specifically, the bases of each staple 3642 in a resultant staple line are collinear, or substantially collinear, with the cavities axes CA.

The staple cavity openings 3612 are arranged in three rows 3614 a, 3614 b, 3614 c on a first side of the longitudinal slot 3604. Inner openings 3612 a define the perimeter of inner cavities 3610 a in the inner row 3614 a, intermediate openings 3612 b define the perimeter of intermediate cavities 3610 b in the intermediate row 3614 b, and outer openings 3612 c define the perimeter of outer cavities 3610 c in the outer row 3614 c. Inner staples 3642 a are positioned in the inner cavities 3610 a, intermediate staples 3642 b are positioned in the intermediate cavities 3610 b, and outer staples 3642 c are positioned in the outer cavities 3610 c. Although not shown in FIG. 80 , in at least one instance, the staple cavities 3610 on the opposing side of the slot 3604 form a mirror image reflection of the staple cavities 3610 on the first side of the longitudinal slot 3604. Consequently, the arrangement of staples 3642 in a resultant staple line is symmetric relative to the cutline. In other instances, the staple line can be asymmetric relative to the cutline.

Each staple cavity opening 3612 has a first end, or proximal end, 3616 and a second end, or distal end, 3618. A cavity axis CA extends between the proximal end 3616 and the distal end 3618 of each opening 3612. The staple cavity openings 3612 in each row are parallel. For example, the inner cavities 3610 a are oriented at an angle A relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(A)) of the inner openings 3612 a are oriented at the angle A relative to the longitudinal axis LA. The intermediate cavities 3610 b are oriented at an angle B relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(B)) of the intermediate openings 3612 b are oriented at the angle B relative to the longitudinal axis LA. The outer cavities 3610 c are oriented at an angle C relative to the longitudinal axis LA. Stated differently, the cavity axes (e.g., CA_(C)) defined by the outer openings 3612 c are oriented at the angle C relative to the longitudinal axis LA.

The angles A, B, and C may be different. The inner openings 3612 a are obliquely oriented relative to the outer openings 3612 c. The angle A is less than the angle C. Because the axes of the outer openings 3612 c (e.g., axis CA_(C)) are not parallel to the axes of the inner openings 3612 a (e.g., axis CA_(A)), the staple cavity openings 3612 in the staple cartridge body 3600 form a modified or skewed herringbone pattern. The cavity axes CA_(B) of the intermediate openings 3612 b can be oriented perpendicular, or substantially perpendicular, to either the inner openings 3612 a or the outer openings 3612 c. For example, the angle B can be a supplementary angle to either angle A or C. In other instances, the angle B may not be a supplementary angle to either angle A or C.

The inner staples 3642 a have a base length BL_(A), the intermediate staples 3642 b have a base length BL_(B), and the outer staples 3642 c have a base length BL_(C). The base length BL_(C) is less than the base length BL_(B), and the base length BL_(B) is less than the base length BL_(A). In other words, the length of the staples 3642 increases laterally toward the longitudinal slot 3604. Moreover, the staple cavities 3610 correspondingly increase in length laterally toward the longitudinal slot 3604 to accommodate the larger staples.

The arrangement of staple cavities 3610 in the cartridge body 3600 provides a longitudinal overlap X_(A/B) between the inner staples 3642 a and the intermediate staples 3642 b at both the proximal and distal ends of the intermediate staples 3642 b. The intermediate staples 3642 b are equidistantly spaced and longitudinally staggered between two adjacent inner staples 3642 a. The arrangement of staple cavities 3610 in the cartridge body 3600 also provides a longitudinal gap X_(B/C) between the intermediate staples 3642 b and the outer staples 3642 c at both the proximal and distal ends of the intermediate staples 3642 b. The intermediate staples 3642 b are also equidistantly spaced and longitudinally staggered between two adjacent outer staples 3642 c. Owing to the variations in the angular orientation of the staples, the spacing of the staples, and the length of the staples, the longitudinal overlap X_(A/B) is greater than the longitudinal gap X_(B/C). In other instances, the longitudinal overlap X_(A/B) can be equal to or less than the longitudinal overlap X_(B/C). The arrangement of staples cavities 3610 in the cartridge body 3600 also provides a lateral gap Y_(A/B) between the inner row 3614 a and the intermediate row 3614 b and a lateral overlap Y_(B/C) between the outer row 3614 c and the intermediate row 3614 b.

Referring still to FIG. 80 , a staple line generated by the staple cartridge body 3600 can have different properties laterally with respect to the cutline. In particular, the staple line may have a greater sealing effectiveness adjacent to the cutline than laterally outward from the cutline. Furthermore, the staple line may have a greater flexibility laterally away from the cutline than inward toward the cutline. For example, because the length of the bases BL_(A), BL_(B), and BL_(C) of the staples 3642 a, 3642 b, and 3642 c, respectively, increases laterally inward toward the cutline, an inner portion of the staple line may have greater sealing effectiveness than an outer portion of the staple line. Additionally or alternatively, because the angular orientation of the staples 3642 a, 3642 b, and 3642 c increases laterally outward away from the cutline, an outer portion of the staple line may have greater flexibility than an inner portion of the staple line.

As described herein, staples are removably positioned in a staple cartridge and fired from the staple cartridge during use. In various instances, the staples can be driven out of staple cavities in the staple cartridge and into forming contact with an anvil. For example, a firing element can translate through the staple cartridge during a firing stroke to drive the staples from the staple cartridge toward an anvil. In certain instances, the staples can be supported by staple drivers and the firing element can lift the staple drivers to eject or remove the staples from the staple cartridge.

An anvil can include a staple-forming surface having staple-forming pockets defined therein. In certain instances, the staple-forming pockets can be stamped in the anvil. For example, the staple-forming pockets can be coined in a flat surface of the anvil. The reader will appreciate that certain features of the staple-forming pockets can be a deliberate consequence of a coining process. For example, a certain degree of rounding at corners and/or edges of the staple-forming produce can be an intentional result of the coining process. Such features can also be designed to better form the staples to their formed configurations, including staples that become skewed and/or otherwise misaligned during deployment.

Each staple in the staple cartridge can be aligned with a staple-forming pocket of the anvil. In other words, the arrangement of staple cavities and staples in a staple cartridge for an end effector can correspond or match the arrangement of staple-forming pockets in an anvil of the end effector. More specifically, the angular orientation of each staple cavity can match the angular orientation of the respective staple-forming pocket. For example, when the staple cavities are arranged in a herringbone pattern, the staple-forming pockets can also be arranged in a herringbone pattern.

When staples are driven from the staple cartridge and into forming contact with the anvil, the staples can be formed into a fired configuration. In various instances, the fired configuration can be a B-form configuration, in which the tips of the staple legs are bent toward the staple base or crown to form a capital letter B having symmetrical upper and lower loops. In other instances, the fired configuration can be a modified B-form, such as a skewed B-form configuration, in which at least a portion of a staple leg torques out of plane with the staple base, or an asymmetrical B-form configuration, in which the upper and lower loops of the capital letter B are asymmetric. Tissue can be captured or clamped within the formed staple.

The arrangement of staples and/or staple cavities in a staple cartridge can be configured to optimize the corresponding arrangement of staple-forming pockets in the forming surface of a complementary anvil. For example, the angular orientation and spacing of staples in a staple cartridge can be designed to optimize the forming surface of an anvil. In certain instances, the footprint of the staple-forming pockets in an anvil can be limited by the geometry of the anvil. In instances in which the staple-forming pockets are obliquely-oriented relative to a longitudinal axis, the width of the anvil can limit the size and spacing of the obliquely-oriented staple-forming pockets. For example, the width of an intermediate row of staple-forming pockets can define a minimum distance between a first row (e.g. an outer row) on one side of the intermediate row and a second row (e.g. an inner row) on the other side of the intermediate row. Moreover, the rows of staple-forming pockets are confined between an inside edge on the anvil, such as a knife slot, and an outside edge of the anvil.

In various instances, the pockets can be adjacently nested along a staple-forming surface of the anvil. For example, an intermediate pocket can be nested between an inner pocket and an outer pocket. The angular orientation of the pockets can vary row-to-row to facilitate the nesting thereof. For example, the staple-forming pockets in an inner row can be oriented at a first angle, the staple-forming pockets in an intermediate row can be oriented at a second angle, and the staple-forming pockets in an outer row can be oriented at a third angle. The first angle, the second angle, and the third angle can be different, which can facilitate the close arrangement of the staple-forming pockets.

Referring again to the staple cartridges depicted in FIGS. 76-80 , the varying angles of the staples and the staple cavities in each row can be selected to optimize the nesting of the staple-forming pockets in a complementary anvil. For each staple cartridge depicted in FIGS. 76-80 , a complementary anvil can be configured to have a corresponding arrangement of staple-forming pockets. Moreover, the staple-forming pockets in the complementary anvils can be larger than the staple cavities depicted in FIGS. 76-80 to ensure that the staple legs land or fall within the staple-forming pockets. For example, the staple legs may be biased outward, such as in the case of V-shaped staples (see FIG. 60 ) and the larger footprint of the staple-forming pockets can catch the outwardly-biased staple legs during firing. In various instances, the staple-forming pockets can be 0.005 inches to 0.015 inches longer than the corresponding staple cavities and/or staples. Additionally or alternatively, the staple-receiving cups of each staple-forming pocket can be 0.005 inches to 0.015 inches wider than the corresponding staple cavities. In other instances, the difference in length and/or width can be less than 0.005 inches or more than 0.015 inches.

In instances in which the size of the staples varies within a staple cartridge (see, e.g., FIGS. 78-80 ), the size of the staple-forming pockets can corresponding vary within a complementary anvil. Varying the size of the staple-forming pockets can further facilitate the nesting thereof. For example, in instances in which staple-forming pockets in an intermediate row are shorter than the staple-forming pockets in an inner row or an outer row, the width of the intermediate row of staple-forming pockets can be reduced, which can minimize the requisite spacing between the inner row and the outer row.

The spacing of the staple-forming pockets can also be configured to optimize the nesting thereof. For example, the pockets arranged in an inner row can be longitudinally staggered relative to the pockets arranged in an outer row. Moreover, the pockets in the inner row can partially longitudinally overlap the pockets in the outer row. The pockets in an intermediate row can be longitudinally staggered relative to the pockets in the inner row and the pockets in the outer row. For example, the pockets in the intermediate row can be equidistantly longitudinally offset from the pockets in the outer row and the pockets in the inner row.

Referring now to FIG. 129 , an anvil 3700 is depicted. The anvil 3700 can be complementary to the staple cartridge 3500 (FIG. 79 ). For example, the arrangement of staple-forming pockets 3706 in the anvil 3700 can correspond to the arrangement of staples 3542 and staple cavities 3510 (FIG. 79 ) in the staple cartridge 3500. The anvil 3700 includes a staple-forming surface 3702 and a longitudinal slot 3704. The longitudinal slot 3704 extends along the longitudinal axis LA of the anvil 3700. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 3704 during at least a portion of a firing stroke. Staple-forming pockets 3706 are defined in the staple-forming surface 3702. The staple-forming surface 3702 also includes a non-forming portion 3708 that extends around the pockets 3706. The non-forming portion 3708 extends entirely around each pocket 3706 in FIG. 129 . In other words, the non-forming portion 3708 surrounds the staple-forming pockets 3706. In other instances, at least a portion of two or more adjacent pockets 3706 can be in abutting contact such that a non-forming portion 3708 is not positioned therebetween.

The forming ratio of the staple-forming surface 3702 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 3708 of the anvil 3700 can be minimized with respect to the staple-forming pockets 3706. Additionally or alternatively, the footprint of the staple-forming pockets 3706 can be extended or enlarged to maximize the portion of the staple-forming surface 3702 that is designed to catch and form the staples.

The pockets 3706 depicted in FIG. 129 are arranged in three rows 3714 a, 3714 b, 3714 c on a first side of the longitudinal slot 3704. The first row 3714 a is an inner row, the second row 3714 b is an intermediate row, and the third row 3714 c is an outer row. Inner pockets 3706 a are positioned in the inner row 3714 a, intermediate pockets 3706 b are positioned in the intermediate row 3714 b, and outer pockets 3706 c are positioned in the outer row 3714 c. The pockets 3706 are arranged in a herringbone arrangement along the staple-forming surface 3702 of the anvil 3700. Although not shown in FIG. 129 , in at least one instance, the pockets 3706 on the opposing side of the slot 3704 can form a mirror image reflection of the pockets 3706 on the first side of the longitudinal slot 3704. In other instances, the arrangement of pockets 3706 in the staple-forming surface 3702 can be asymmetrical relative to the slot 3704 and, in certain instances, the anvil 3700 may not include the longitudinal slot 3704. In various instances, the pockets 3706 can be arranged in less than or more than three rows on each side of the slot 3704.

Each pocket 3706 includes a perimeter 3716, which defines the boundary of the pocket 3706 b. Each pocket 3706 also includes a proximal cup 3720, a distal cup 3722, and a neck portion 3724 connecting the proximal cup 3720 and the distal cup 3722. When a staple is driven into forming contact with the staple-forming surface 3702, the proximal cup 3720 is aligned with a proximal staple leg, and the distal cup 3722 is aligned with a distal staple leg. The tips of the staple legs are positioned and configured to land in the respective cups 3720, 3722. Stated differently, the proximal cup 3720 is configured to receive a proximal staple leg and the distal cup 3722 is configured to receive a distal staple leg. The cups 3720 and 3722 are also configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 3806, such as the neck portion 3724, and to deform the staple legs into the formed configuration.

The geometry, spacing, and/or orientation of the pockets 3706 can vary row-to-row. A pocket axis PA extends from the proximal cup 3720, through the neck portion 3724, and to the distal cup 3722 of each pocket 3706. The pockets 3706 in each row are parallel. For example, the inner pockets 3706 a are oriented at an angle A relative to the longitudinal axis LA. Stated differently, the pocket axes (e.g., PA_(A)) of the inner pockets 3706 a are oriented at the angle A relative to the longitudinal axis LA. The intermediate pockets 3706 b are oriented at an angle B relative to the longitudinal axis LA. Stated differently, the pocket axes (e.g., PA_(B)) of the inner pockets 3706 b are oriented at the angle B relative to the longitudinal axis LA. The outer pockets 3706 c are oriented at an angle C relative to the longitudinal axis LA. Stated differently, the pocket axes (e.g., PA_(C)) of the inner pockets 3706 a are oriented at the angle C relative to the longitudinal axis LA.

The angles A, B, and C may be different. The inner pockets 3706 a are obliquely oriented relative to the outer pockets 3706 c. The angle A is less than the angle C. Because the axes of the outer pockets 3706 c (e.g., axis PA_(C)) are not parallel to the axes of the inner pockets 3706 a (e.g., axis PA_(A)), the staple-forming pockets 3706 in the anvil 3700 form a modified or skewed herringbone pattern. The pocket axes PA_(B) of the intermediate pockets 3706 b are obliquely oriented relative to the inner pockets 3706 a and outer pockets 3706 c. In other instances, the pocket axes PA_(B) of the intermediate pockets 3706 b can be oriented perpendicular, or substantially perpendicular, to either the inner pocket 3706 a or the outer pocket 3706 c. For example, the angle B can be a supplementary angle to either angle A or C.

The inner pockets 3706 a have a length L_(A), the intermediate pockets 3706 b have a length L_(B), and the outer pockets 3706 c have a length L_(C). The length L_(C) is less than the length L_(B) and the length L_(A). In other words, the outer pockets 3706 c are shorter than the intermediate pockets 3706 b and the inner pockets 3706 a. In certain instances, the lengths L_(A), L_(B), and L_(C) can be different. In other instances, the lengths L_(A), L_(B), and L_(C) can be the same. In still other instances, the length L_(B) can be less than the length L_(A) and/or L_(B), and/or the length L_(A) can be less than the length L_(A) and/or L_(C). The lengths L_(A), L_(B), and L_(C) can be selected to optimize the nesting of the pockets 3706.

The spacing of the staple-forming pockets 3706 can also be configured to optimize the nesting thereof. For example, the inner pockets 3706 a can be longitudinally staggered relative to the outer pockets 3706 c. Moreover, the inner pockets 3706 a can partially longitudinally overlap the outer pockets 3706 c. Referring to FIG. 129 , a first end of the inner pocket 3706 a is longitudinally offset from the corresponding end of the outer pocket 3706 c by a distance X1 _(A/C). Moreover, a second end of the inner pocket 3706 a is longitudinally offset from the corresponding end of the outer pocket 3706 c by a distance X2 _(A/C). The distance X2 _(A/C) is less than the distance X1 _(A/C). In other instances, the distance X2 _(A/C) can be equal to or greater than the distance X1 _(A/C). The intermediate pockets 3706 b are longitudinally staggered relative to the inner pockets 3706 a and the outer pockets 3706 c. More specifically, the intermediate pockets 3706 b are equidistantly longitudinally offset between adjacent inner pockets 3706 a and between adjacent outer pockets 3706 c. In other instances, the intermediate pockets 3706 b may be non-equidistantly offset between adjacent inner pockets 3706 a and between adjacent outer pockets 3706 c.

The arrangement of pockets 3706 is configured to nest the pockets 3706 such that the pockets 3706 fit within a predefined space. For example, in certain instances, the width of the anvil can be minimized or otherwise restrained to fit within a surgical trocar and/or within a narrow surgical field, and the arrangement of staple-forming pockets 3706 (and the corresponding arrangement of staples and/or staple cavities) can fit within a narrow anvil.

Referring now to FIGS. 81-84C, staple-forming pockets 3806 in a portion of an anvil 3800 are shown. The anvil 3800 includes a staple-forming surface 3802 and a longitudinal slot 3804. The longitudinal slot 3804 extends along the longitudinal axis LA of the anvil 3800. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 3804 during at least a portion of a firing stroke. The staple-forming pockets 3806 are defined in the staple-forming surface 3802, which also includes a non-forming portion 3808 that extends around the pockets 3806. The non-forming portion 3808 extends entirely around each pocket 3806. In other words, the non-forming portion 3808 surrounds the staple-forming pockets 3806. In other instances, at least a portion of two or more adjacent pockets can be in abutting contact such that a non-forming portion is not positioned therebetween. In certain instances, the non-forming portion 3808 can extend across one or more of the pockets 3806.

The “forming ratio” of the staple-forming surface 3802 (the ratio of the non-forming portion 3808 to the forming portion, i.e., the pockets 3806) can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 3808 of the anvil 3800 can be minimized with respect to the staple-forming pockets 3806. Additionally or alternatively, the footprint of the staple-forming pockets 3806 can be extended or enlarged to maximize the portion of the staple-forming surface 3802 that is designed to catch and form the staples. Such arrangement, for example, may prevent inadvertent malformed staples that, for whatever reason, miss or fall outside of their corresponding forming pocket during the firing process.

The pockets 3806 depicted in FIG. 81 are arranged in three rows 3814 a, 3814 b, and 3814 c on a first side of the longitudinal slot 3804. The first row 3814 a is an inner row, the second row 3814 b is an intermediate row, and the third row 3814 c is an outer row. Inner pockets 3806 a are positioned in the inner row 3814 a, intermediate pockets 3806 b are positioned in the intermediate row 3814 b, and outer pockets 3806 c are positioned in the outer row 3814 c. Although not shown in FIG. 81 , in at least one instance, the pockets 3806 on the opposing side of the slot 3804 can form a mirror image reflection of the pockets 3806 on the first side of the longitudinal slot 3804. In other instances, the arrangement of pockets 3806 in the staple-forming surface 3802 can be asymmetrical relative to the slot 3804 and, in certain instances, the anvil 3800 may not include the longitudinal slot 3804. In various instances, the pockets 3806 can be arranged in less than or more than three rows on each side of the slot 3804.

The pockets 3806 depicted in FIG. 81 are identical. Each pocket 3806 defined in the staple-forming surface 3802 has the same geometry. In other instances, the geometry of the pockets 3806 can vary row-to-row and/or longitudinally along the length of the anvil 3800. For example, in certain instances, the depth of the pockets 3806 or portions thereof can vary along the length of the anvil 3800 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 3806 b is shown in FIGS. 82-84C. The pocket 3806 b has a first end, or proximal end, 3810 and a second end, or distal end, 3812. A pocket axis PA extends between the proximal end 3810 and the distal end 3814 of the pocket 3806 b. Referring again to FIG. 81 , the pockets 3806 in each respective row are parallel. For example, the pocket axes (e.g., PA_(A)) of the inner pockets 3806 a are parallel to each other, the pocket axes (e.g., PA_(B)) of the intermediate pockets 3806 b are parallel to each other, and the pocket axes (e.g., PA_(C)) of the outer pockets 3806 c are parallel to each other. The pocket axes PA are obliquely oriented relative to the slot 3804. Moreover, the axes PA_(B) of the intermediate pockets 3806 b are oriented perpendicular to the axes PA_(A) and PA_(C) of the inner pockets 3806 a and the outer pockets 3806 c, respectively. As such, the pockets 3806 are arranged in a herringbone arrangement along the staple-forming surface 3802.

The pocket 3806 b includes a perimeter 3816, which defines the boundary of the pocket 3806 b. The pocket 3806 b also includes a proximal cup 3820, a distal cup 3822, and a neck portion 3824 connecting the proximal cup 3820 and the distal cup 3822. When a staple is driven into forming contact with the staple-forming surface 3802, the proximal cup 3820 is aligned with a proximal staple leg, and the distal cup 3822 is aligned with a distal staple leg. The tips of the staple legs are positioned and configured to land in the respective cups 3820, 3822. Stated differently, the proximal cup 3820 is configured to receive a proximal staple leg and the distal cup 3822 is configured to receive a distal staple leg. The cups 3820 and 3822 are also configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 3806, such as the neck portion 3824, and to deform the staple legs into the formed configuration.

The pockets 3806 include extended landing zones for the staple legs. Referring to the pocket 3806 b depicted in FIG. 82 , the pocket 3806 b includes a proximal extended landing zone 3830 and a distal extended landing zone 3832. The proximal extended landing zone 3830 is positioned in a proximal portion of the proximal cup 3820, and the distal extended landing zone 3832 is positioned in a distal portion of the distal cup 3822. The extended landing zones 3830 and 3832 define a substantially triangular perimeter. Moreover, the extended landing zones 3830 and 3832 terminate along the pocket axis PA at a point to form corners of the pocket 3806 b.

In other instances, the extended landing zones 3830 and 3832 can define straight and/or contoured perimeters, for example, and may extend laterally and/or longitudinally relative to the pocket axis PA. In instances where a staple or portion thereof is skewed during firing, the extended landing zones 3830, 3832 can salvage, or at least attempt to salvage, the formation of the skewed staple.

Referring primarily to FIG. 83 , each cup 3820, 3822 of the pocket 3806 b defines an entrance ramp 3840 and an exit ramp 3842. The exit ramp 3842 is steeper than the entrance ramp 3840. When forming a staple, the tip of a staple leg can enter the respective cup 3820, 3822 along the entrance ramp 3840 and exit the respective cup 3820, 3822 along the exit ramp 3842. At an apex 3846 between the entrance ramp 3840 and the exit ramp 3842, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The proximal cup 3820 defines a proximal depth D₁ at the apex 3846 thereof measured relative to the non-forming portion 3808 of the staple-forming surface 3802, and the distal cup 3822 defines a distal depth D₂ at the apex 3846 thereof measured relative to the non-forming portion 3808 of the staple-forming surface 3802. In the pocket 3806 b, the proximal depth D₁ and the distal depth D₂ are equal. In other instances, the proximal depth D₁ and the distal depth D₂ can be different.

The pocket 3806 b also defines a bridge 3844 in the neck portion 3824 between the proximal cup 3820 and the distal cup 3822. The bridge 3844 is offset from the non-forming portion 3808 of the staple-forming surface 3802. More specifically, the bridge 3844 is positioned below or recessed relative to the non-forming portion 3808. In other instances, the bridge 3844 can be aligned with the non-forming portion 3808 and/or can protrude away from the non-forming portion 3808 toward the opposing jaw of the end effector.

Referring primarily to FIGS. 84A-84C, the pocket 3806 b includes sidewalls 3850. The sidewalls 3850 are oriented perpendicular to the non-forming portion 3808 of the staple-forming surface 3802. The sidewalls 3850 widen toward a central region 3821 of each cup 3820, 3822, and narrow from the central region 3821 of each cup 3820, 3822 toward the neck portion 3824. The widened central region 3821 provides an enlarged footprint for receiving the tip of a staple leg. The extended landing zones 3830, 3832 also enlarge the footprint of the respective cups 3820, 3822 for receiving the staple tips. As the cups 3820, 3822 narrow toward the neck portion 3824, the cups 3820, 3822 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration. As the cups 3820 and 3822 widen and then narrow toward the neck portion 3824, the perimeter 3816 of the pocket 3806 b defines a contour or arced profile. In other instances, the perimeter 3816 of the pocket 3806 b can extend along linear, non-contoured profiles having non-rounded corners, for example.

The pocket 3806 b defines fillets 3852 (FIGS. 84A-84C) between the sidewalls 3850 and the bottom surface of the pocket 3806 b. The fillets 3852 are configured to guide the staple legs along the desired path in the pocket 3806 b. For example, if a staple leg lands along the fillet 3852 or is diverted to the fillet 3852, the fillet 3852 can smoothly guide the staple leg toward the pocket axis PA.

Referring again to FIG. 82 , the pocket 3806 b is symmetric about the pocket axis PA. For example, the perimeter 3816 of the pocket 3806 b is symmetric about the pocket axis PA. Moreover, the pocket 3806 b is symmetric about a central axis CA through the neck portion 3824 and perpendicular to the pocket axis PA. For example, the perimeter 3816 of each pocket 3806 is symmetric about the central axis CA, and the proximal cup 3820 has the same geometry as the distal cup 3822.

In other instances, the proximal cup 3820 can be different than the distal cup 3822. For example, referring again to FIG. 83 , the distal depth D₂ can be less than the proximal depth D₁. In various instances, the variation in the depth of a staple-forming pocket can accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector when tissue is clamped therebetween. For example, an anvil may bow or bend away from the staple cartridge as the anvil approaches the distal end of the end effector. Variations to the depth of the staple-forming pockets 3806 can be configured to ensure that an appropriate forming height is maintained in view of the anticipated or expected bowing or bending of the anvil 3800.

Additionally or alternatively, the variation in the depth of a staple-forming pocket can accommodate for tissue movement or flow relative to the end effector. More specifically, when tissue is clamped between the jaws of the end effector, fluid in the clamped tissue can flow or move toward adjacent, unclamped tissue. The tissue can flow laterally toward the longitudinal sides of the anvil 3800, distally toward the distal end of the anvil 3800, and/or proximally toward the proximal end of the anvil 3800. In certain instances, tissue can flow relative to the anvil 3800 when the cutting edge is advanced distally through the tissue. In such instances, tissue may flow laterally, distally, and/or proximally, but it primarily flows distally due to the distal movement of the cutting edge. In instances where the cutting edge moves proximally to incise tissue, the movement or flow of the tissue would be generally proximal during the cutting stroke. Different depths D₁ and D₁ in the pocket 3806 can accommodate for the distal flow of the tissue, which can shift or skew the staple legs embedded therein distally.

In various instances, tissue movement or flow at the distal end of an end effector can be larger than the tissue movement or flow at the proximal end of the end effector. Such instances can arise as a result of the distal movement of the firing member within the end effector. Although the firing member is configured to progressively staple and incise the tissue as it is moved distally, the firing member can also plow or push the tissue distally. This pushing or plowing effect may begin at the proximal end of the end effector and may compound as the firing member is moved distally such that the largest pushing or plowing effect is realized at the distal end of the end effector. Consequently, the tissue flow can be increased toward the distal end of the end effector. To accommodate for such an increase in tissue flow, the geometries of the staple pockets can vary longitudinally along the length of a row. In instances where the proximal and distal cups of the staple pockets are different to accommodate for tissue flow, a gradient in pocket asymmetries may be utilized within a row of pockets to compensate for the gradient in tissue movement and staple shifting.

In certain instances, different staple geometries can be utilized with the different pocket geometries. The use of different staples to accommodate for tissue flow along the length of an end effector is described in U.S. patent application Ser. No. 14/318,996, entitled FASTENER CARTRIDGES INCLUDING EXTENSIONS HAVING DIFFERENT CONFIGURATIONS, filed Jun. 30, 2014, which is hereby incorporated by reference herein in its entirety. In other instances, identical staples can be utilized with different pocket geometries along the length of an anvil.

Referring again to FIG. 82 , the neck portion 3824 defines a width W_(N) and the proximal and distal cups 3820 and 3822 define a width W_(C). The width W_(N) is less than the width W_(C). Consequently, the central portion of the pocket 3806 b is narrower than the proximal and distal cups 3820 and 3822. The narrowed perimeter 3816 of the pocket 3806 b at the neck portion 3824 defines a receiving peninsula 3826 between a portion of the proximal cup 3820 and a portion of the distal cup 3822. Owing to the symmetry of the pocket 3806 b, symmetrical receiving peninsulas 3826 are positioned on each side of the pocket 3806 b. The receiving peninsulas 3826 are bounded by the perimeter 3816 of the pocket 3806 b and a tangent axis (e.g., T_(A), T_(B1), T_(B2), and T_(C)), which is tangential to the widest portion of the proximal and distal cups 3820 and 3822 on a side of the pocket 3806. A first tangent axis T_(B1) is positioned on a first side of the pocket 3806 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 3806 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 82 are parallel to the pocket axis PA_(B).

Referring again to FIG. 81 , the perimeters 3816 of the pockets 3806 are nested or interlocked along the staple-forming surface 3802. In particular, each pocket 3806 extends into the receiving peninsula 3826 of an adjacent pocket 3806. For example, the intermediate pockets 3806 b are nested between the inner pockets 3806 a and the outer pockets 3806 c. Stated differently, the intermediate pockets 3806 b extend into the receiving peninsula 3826 of an adjacent inner pocket 3806 a and into the receiving peninsula 3826 of an adjacent outer pocket 3806 c. Moreover, the inner pockets 3806 a and the outer pockets 3806 b are nested with the intermediate pockets 3806 b. More specifically, the inner pockets 3806 a extend into the receiving peninsula 3826 of an adjacent intermediate pocket 3806 b, and the outer pockets 3806 c extend into the receiving peninsula 3826 of an adjacent intermediate pocket 3806 b.

The distal cup 3822 of the intermediate pocket 3806 b extend across the tangent axis T_(A) and into the receiving peninsula 3826 of the adjacent inner pocket 3806 a. Moreover, the proximal cup 3820 of the intermediate pocket 3806 b extends across the tangent axis T_(C) and into the receiving peninsula 3826 of the adjacent outer pocket 3806 c. Additionally, the distal cup 3822 of the inner pockets 3806 a extends across the tangent axis T_(B1) and into the receiving peninsula 3826 of the adjacent intermediate pocket 3806 b. Furthermore, the proximal cup 3820 of the outer pockets 3806 c extends across the tangent axis T_(B2) and into the receiving peninsula 3826 of the adjacent intermediate pocket 3806 b. In various instances, the distal extended landing zone 3832 of the intermediate pocket 3806 b is positioned in the receiving peninsula 3826 of an inner pocket 3806 a, the proximal extended landing zone 3830 of the intermediate pocket 3806 b is positioned in the receiving peninsula 3826 of an outer pocket 3806 c, the distal extended landing zone 3832 of an inner pocket 3806 a is positioned in the receiving peninsula 3826 of an intermediate pocket 3806 b, and the proximal extended landing zone 3830 of the outer pocket 3806 c is positioned in the receiving peninsula 3826 of an intermediate pocket 3806 b.

The geometry of the pockets 3806 facilitates the nesting of the pockets 3806 in the staple-forming surface 3802. For example, because the pockets 3806 include a narrowed neck portion 3824 between two enlarged cups 3820 and 3822, one of the enlarged cups 3820, 3822 of another pocket 3806 can be positioned adjacent to the narrowed neck portion 3824. For example, one of the enlarged cups 3820, 3822 can be aligned with and/or received by a portion of an adjacent pocket 3806. In such instances, the surface area of the staple-forming surface 3802 that is covered by the pockets 3806 can be optimized. For example, the surface area of the staple-forming surface 3802 that is covered by the pockets 3806 is maximized. The “forming ratio” of the staple-forming surface 3802 is the ratio of the non-forming portion 3808 to the forming portion, i.e., the pockets 3806. The forming ratio is about 1.7:1. In other instances, the forming ratio can be less than 1.7:1 or more than 1.7:1. For example, in at least one instance, more than 50% of the staple-forming surface 3802 can be covered with staple-forming pockets 3806.

The nesting of staple-forming pockets discussed herein can refer to the nesting of adjacent pocket perimeters. For example, where a first pocket defines an inward contour, i.e., a contour extending inward toward the pocket axis, an adjacent second pocket can protrude toward and/or into the region adjacent to the inward contour. Additionally or alternatively, a portion of the second pocket, such as an end of the second pocket, can be aligned with the narrowed region of the first pocket. Consequently, the second pocket can be positioned nearer to the pocket axis of the first pocket than if the end of the second pocket was aligned with a wider region of the first pocket.

Referring now to FIGS. 85-88C, staple-forming pockets 3906 in a portion of an anvil 3900 are depicted. The anvil 3900 includes a staple-forming surface 3902 and a longitudinal slot 3904. The longitudinal slot 3904 extends along the longitudinal axis LA of the anvil 3900. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 3904 during at least a portion of a firing stroke. The staple-forming pockets 3906 are defined in the staple-forming surface 3902. The staple-forming surface 3902 also includes a non-forming portion 3908 that extends around the pockets 3906. The non-forming portion 3908 extends entirely around each pocket 3906 in FIG. 85 . In other words, the non-forming portion 3908 surrounds the staple-forming pockets 3906. In other instances, at least a portion of two or more adjacent pockets 3906 can be in abutting contact such that a non-forming portion 3908 is not positioned therebetween.

The forming ratio of the staple-forming surface 3902 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 3908 of the anvil 3900 can be minimized with respect to the staple-forming pockets 3906. Additionally or alternatively, the footprint of the staple-forming pockets 3906 can be extended or enlarged to maximize the portion of the staple-forming surface 3902 that is designed to catch and form the staples.

The pockets 3906 depicted in FIG. 85 are arranged in three rows 3914 a, 3914 b, 3914 c on a first side of the longitudinal slot 3904. The first row 3914 a is an inner row, the second row 3914 b is an intermediate row, and the third row 3914 c is an outer row. Inner pockets 3906 a are positioned in the inner row 3914 a, intermediate pockets 3906 b are positioned in the intermediate row 3914 b, and outer pockets 3906 c are positioned in the outer row 3914 c. Similar to the anvil 3800, the pockets 3906 are arranged in a herringbone arrangement along the staple-forming surface 3902 of the anvil 3900. Although not shown in FIG. 85 , in at least one instance, the pockets 3906 on the opposing side of the slot 3904 can form a mirror image reflection of the pockets 3906 on the first side of the longitudinal slot 3904. In other instances, the arrangement of pockets 3906 in the staple-forming surface 3902 can be asymmetrical relative to the slot 3904 and, in certain instances, the anvil 3900 may not include the longitudinal slot 3904. In various instances, the pockets 3906 can be arranged in less than or more than three rows on each side of the slot 3904.

The pockets 3906 depicted in FIG. 85 are identical. Each pocket 3906 defined in the staple-forming surface 3802 has the same geometry. In other instances, the geometry of the pockets 3906 can vary row-to-row and/or longitudinally along the length of the anvil 3900. For example, in certain instances, the depth of the pockets 3906 or portions thereof can vary along the length of the anvil 3900 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 3906 b is shown in FIGS. 86-88C. The pocket 3906 b has a first end, or proximal end, 3910 and a second end, or distal end, 3912. A pocket axis PA (FIG. 86 ) extends between the proximal end 3910 and the distal end 3912 of the pocket 3906 b. The pocket 3906 b includes a perimeter 3916, which defines the boundary of the pocket 3906. The pocket 3906 b also includes a proximal cup 3920, a distal cup 3922, and a neck portion 3924 connecting the proximal cup 3920 and the distal cup 3922. When a staple is driven into forming contact with the staple-forming surface 3902, the proximal cup 3920 is aligned with a proximal staple leg, and the distal cup 3922 is aligned with a distal staple leg. The cups 3920 and 3922 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 3906, such as the neck portion 3924, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 87 , each cup 3920, 3922 of the pocket 3906 b defines an entrance ramp 3940 and an exit ramp 3942. The exit ramp 3942 is steeper than the entrance ramp 3940. When forming a staple, the tip of a staple leg can enter the respective cup 3920, 3922 along the entrance ramp 3940 and exit the respective cup 3920, 3922 along the exit ramp 3942. At an apex 3946 between the entrance ramp 3940 and the exit ramp 3942, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The proximal cup 3920 defines a proximal depth D₁ at the apex 3946 thereof measured relative to the non-forming portion 3908 of the staple-forming surface 3902, and the distal cup 3922 defines a distal depth D₂ at the apex 3946 thereof measured relative to the non-forming portion 3908 of the staple-forming surface 3902. In the pocket 3906, the proximal depth D₁ and the distal depth D₂ are equal. In other instances, the proximal depth D₁ and the distal depth D₂ can be different. The pocket 3906 b also defines a bridge 3944 in the neck portion 3924 between the proximal cup 3920 and the distal cup 3922. The bridge 3944 is offset from the non-forming portion 3908 of the staple-forming surface 3902. More specifically, the bridge 3944 is positioned below or recessed relative to the non-forming portion 3908.

Referring primarily to FIGS. 88A-88C, the pocket 3906 b includes sidewalls 3950. The sidewalls 3950 are oriented perpendicular to the non-forming portion 3908 of the staple-forming surface 3902. The sidewalls 3950 narrow linearly from the outer ends of each cup 3920, 3922 toward the neck portion 3924. Consequently, the widest portion of the cups 3920, 3922 is at the proximal and distal ends 3910, 3912 of the pocket 3906 b, respectively. The profile 3916 of the pocket 3906 b defines a bow-tie shape perimeter. The widened region at the proximal and distal ends 3910, 3912 provides an enlarged footprint for receiving the tip of a staple leg. In various instances, the widened portions of the cups 3920 and 3922 define extended landing zones for receiving the staple tips. As the cups 3920, 3922 narrow toward the neck portion 3924, the cups 3920, 3922 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA into a formed configuration. The pocket 3906 b defines a chamfered edge 3954 along the sides of the pocket 3906 b. The chamfered edge 3954 serves to enlarge the footprint of the pocket 3906 b and guide the tips of the staple legs toward the pocket axis PA.

Referring again to FIG. 86 , the pocket 3906 b is symmetric about the pocket axis PA. For example, the perimeter 3916 of the pocket 3906 b is symmetric about the pocket axis PA. Moreover, the pocket 3906 b is symmetric about a central axis CA through the neck portion 3924 and perpendicular to the pocket axis PA. For example, the perimeter 3916 of the pocket 3906 b is symmetric about the central axis CA, and the proximal cup 3920 has the same geometry as the distal cup 3922. In other instances, the proximal cup 3920 can be different than the distal cup 3922. For example, referring again to FIG. 87 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 86 , the width of the neck portion 3924 is less than the width of the cups 3920 and 3922. Consequently, the central portion of the pocket 3906 b is narrower than the proximal and distal cups 3920 and 3922. The narrowed perimeter 3916 of the pocket 3906 b at the neck portion 3924 defines a receiving peninsula 3926 between a portion of the proximal cup 3920 and a portion of the distal cup 3922. Owing to the symmetry of the pocket 3906 b, symmetrical receiving peninsulas 3926 are positioned on each side of the pocket 3906 b. The receiving peninsulas 3926 are bounded by the perimeter 3916 of the pocket 3906 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portion of the proximal and distal cups 3920 and 3922 on a side of the pocket 3906 b. A first tangent axis T_(B1) is positioned on a first side of the pocket 3906 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 3906 b. The first and second tangent axes T_(B1) and T_(B2) are parallel to the pocket axis PA.

Referring again to FIG. 85 , each pocket 3906 extends toward the receiving peninsula 3926 of an adjacent pocket 3906. For example, the intermediate pockets 3906 b are aligned with the neck portions 3924 of the inner pockets 3906 a and the outer pockets 3906 c. Moreover, the inner pockets 3906 a and the outer pockets 3906 b extend toward the receiving peninsula 3926 of one of the intermediate pockets 3906 b. More specifically, the pocket axes PA of the intermediate pockets 3906 b are aligned with the neck portions 3924 of adjacent inner and outer pockets 3906 a and 3906 c, respectively, the pocket axes PA of the inner pockets 3906 a are aligned with the neck portion 3924 of an adjacent intermediate pocket 3906 b, and the pocket axes PA of the outer pockets 3906 c are aligned with the neck portion 3924 of an adjacent intermediate pocket 3906 b. In certain instances, a portion of one or more of the pockets 3906 can extend into the receiving peninsula of an adjacent pocket 3906.

The geometry of the pockets 3906 facilitates the close arrangement of the pockets 3906 in the staple-forming surface 3902. For example, because the pockets 3906 include a narrowed neck portion 3924 between two enlarged cups 3920 and 3922, the enlarged cup 3920, 3922 of another pocket 3906 can be positioned adjacent to the narrowed neck portion 3924. For example, an enlarged cup 3920, 3922 can be aligned with and/or received by a portion of the adjacent pocket 3906. Consequently, the surface area of the staple-forming surface 3902 that is covered by the pockets 3906 can be optimized. For example, the surface area of the staple-forming surface 3902 that is covered by pockets 3906 is maximized. The “forming ratio” is the ratio of the non-forming portion 3908 to the forming portion, i.e., the pockets 3906. In various instances, the forming ratio can be at least 1:1, for example.

In certain instances, though the pockets 3906 are positioned in close proximity to each other, because the neck portion 3924 narrows, there is space for the non-forming portion 3908 between adjacent pockets 3906. For example, the non-forming portion 3908 can extend between the neck portion 3924 of an inner pocket 3906 a and the distal cup 3922 of an adjacent intermediate pocket 3906 b. The non-forming portion 3908 between adjacent pockets 3906 can provide sufficient spacing between pockets 3906 to strengthen and/or reinforce the anvil 3900.

Referring now to FIGS. 89-92C, staple-forming pockets 4006 in a portion of an anvil 4000 are depicted. The pockets 4006 and arrangement thereof in the anvil 4000 are similar in many aspects to the pockets 3906 and arrangement thereof in the anvil 3900. For example, the anvil 4000 includes a staple-forming surface 4002 and a longitudinal slot 4004. The longitudinal slot 4004 extends along the longitudinal axis LA of the anvil 4000. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 4004 during at least a portion of a firing stroke. The staple-forming pockets 4006 are defined in the staple-forming surface 4002. The staple-forming surface 4002 also includes a non-forming portion 4008 that extends around the pockets 4006. The non-forming portion 4008 extends entirely around each pocket 4006 in FIG. 89 . In other words, the non-forming portion 4008 surrounds the staple-forming pockets 4006. In other instances, at least a portion of two or more adjacent pockets 4006 can be in abutting contact such that a non-forming portion 4008 is not positioned therebetween.

The forming ratio of the staple-forming surface 4002 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 4008 of the anvil 4000 can be minimized with respect to the staple-forming pockets 4006. Additionally or alternatively, the footprint of the staple-forming pockets 4006 can be extended or enlarged to maximize the portion of the staple-forming surface 4002 that is designed to catch and form the staples.

The pockets 4006 are arranged in an inner row 4014 a, an intermediate row 4014 b, and an outer row 4014 c on a first side of the longitudinal slot 4004. Inner pockets 4006 a are positioned in the inner row 4014 a, intermediate pockets 4006 b are positioned in the intermediate row 4014 b, and outer pockets 4006 c are positioned in the outer row 4014 c. Similar to the anvil 3800, the pockets 4006 are arranged in a herringbone arrangement along the staple-forming surface 4002 of the anvil 4000. Although not shown in FIG. 89 , in at least one instance, the pockets 4006 on the opposing side of the slot 4004 can form a mirror image reflection of the pockets 4006 on the first side of the longitudinal slot 4004. In other instances, the arrangement of pockets 4006 in the staple-forming surface 4002 can be asymmetrical relative to the slot 4004 and, in certain instances, the anvil 4000 may not include the longitudinal slot 4004. In various instances, the pockets 4006 can be arranged in less than or more than three rows on each side of the slot 4004.

The pockets 4006 depicted in FIG. 89 are identical. Each pocket 4006 defined in the staple-forming surface 4002 has the same geometry. In other instances, the geometry of the pockets 4006 can vary row-to-row and/or longitudinally along the length of the anvil 4000. For example, in certain instances, the depth of the pockets 4006 or portions thereof can vary along the length of the anvil 4000 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 4006 b is shown in FIGS. 90-92C. The pocket 4006 b has a first end, or proximal end, 4010 and a second end, or distal end, 4012. A pocket axis PA (FIG. 90 ) extends between the proximal end 4010 and the distal end 4012 of the pocket 4006 b. The pocket 4006 b includes a perimeter 4016, which defines the boundary of the pocket 4006 b. The pocket 4006 b also includes a proximal cup 4020, a distal cup 4022, and a neck portion 4024 connecting the proximal cup 4020 and the distal cup 4022. When a staple is driven into forming contact with the staple-forming surface 4002, the proximal cup 4020 is aligned with a proximal staple leg, and the distal cup 4022 is aligned with a distal staple leg. The cups 4020 and 4022 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 4006, such as the neck portion 4024, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 91 , each cup 4020, 4022 of the pocket 4006 b defines an entrance ramp 4040 and an exit ramp 4042. When forming a staple, the tip of a staple leg can enter the respective cup 4020, 4022 along the entrance ramp 4040 and exit the respective cup 4020, 4022 along the exit ramp 4042. At an apex 4046 between the entrance ramp 4040 and the exit ramp 4042, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 4006 b also defines a bridge 4044 between the proximal cup 4020 and the distal cup 4022. The bridge 4044 is offset from the non-forming portion 4008. More specifically, the bridge 4044 is positioned below or recessed relative to the non-forming portion 4008.

Referring primarily to FIGS. 92A-92C, the pocket 4006 b includes sidewalls 4050, which are oriented perpendicular to the non-forming portion 4008 of the staple-forming surface 4002. The sidewalls 4050 narrow from the outer ends of each cup 4020, 4022 toward the neck portion 4024. Consequently, the widest portion of the cups 4020, 4022 is at the proximal and distal ends 4010, 4012 of the pocket 4006 b, respectively. The profile 4016 of the pocket 4006 b defines a bow-tie shape perimeter. The widened region at the proximal and distal ends 4010, 4012 provides an enlarged footprint for receiving the tip of a staple leg. In various instances, the widened portions of the cups 4020, 4022 define extended landing zones for receiving the staple tips. As the cups 4020, 4022 narrow toward the neck portion 4024, the cups 4020, 4022 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration.

The pocket 4006 b defines a chamfered edge 4054 along the sides of the pocket 4006 b. Additionally, the pocket 4006 b includes a groove 4056 in the bottom surface 4058 thereof. The groove 4056 extends from the proximal cup 4020 over the bridge 4024 and into the distal cup 4022. The groove 4056 is configured to constrain and guide the staple legs as they move to the deformed configuration.

In various instances, the diameter of the groove 4056 can be less than the diameter of the staple engaged with the groove 4056. For example, a staple can have a diameter of at least 0.0079 inches, and the diameter of the groove 4056 can be less than 0.0079 inches. The diameter of the groove 4056 can be about 0.007 inches, about 0.005 inches, or less than 0.005 inches. In certain instances, the staple can have a diameter of more than 0.0079 inches, such as about 0.0089 inches or about 0.0094 inches, for example. In various instances, the diameter of the staple can be less than 0.0079 inches or more than 0.0094 inches. In end effectors in which different staple geometries are utilized with the same staple-forming pocket geometry, the width of the groove in the pocket can be less than the smallest diameter staple. In still other instances, the width of the groove 4056 can vary staple-to-staple within a row and/or row-to-row.

Referring again to FIG. 90 , the pocket 4006 b is symmetric about the pocket axis PA. For example, the perimeter 4016 of the pocket 4006 b is symmetric about the pocket axis PA. Moreover, the pocket 4006 b is symmetric about a central axis CA through the neck portion 4024 and perpendicular to the pocket axis PA. For example, the perimeter 4016 of the pocket 4006 b is symmetric about the central axis CA, and the proximal cup 4020 has the same geometry as the distal cup 4022. In other instances, the proximal cup 4020 can be different than the distal cup 4022. For example, referring again to FIG. 91 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 90 , the neck portion 4024 of the pocket 4006 b is narrower than the proximal and distal cups 4020 and 4022. The narrowed perimeter 4016 of the pocket 4006 b defines a receiving peninsula 4026 between a portion of the proximal cup 4020 and a portion of the distal cup 4022. Owing to the symmetry of the pocket 4006 b, symmetrical receiving peninsulas 4026 are positioned on each side of the pocket 4006 b. The receiving peninsulas 4026 are bounded by the perimeter 4016 of the pocket 4006 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portion of the proximal and distal cups 4020 and 4022 on a side of the pocket 4006 b. A first tangent axis T_(B1) is positioned on a first side of the pocket 4006 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 4006 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 90 are parallel to the pocket axis PA.

Referring again to FIG. 89 , each pocket 4006 extends toward the receiving peninsula 4026 of an adjacent pocket 4006. For example, the intermediate pockets 4006 b are aligned with the neck portions 4024 of the inner pockets 4006 a and the outer pockets 4006 c. Moreover, the inner pockets 4006 a and the outer pockets 4006 b extend toward the receiving peninsula 4026 of one of the intermediate pockets 4006 b. More specifically, the inner pockets 4006 a are aligned with the neck portion 4024 of an adjacent intermediate pocket 4006 b, and the outer pockets 4006 c are aligned with the neck portion 4024 of an adjacent intermediate pocket 4006 b. In certain instances, a portion of the pockets 4006 can extend into the receiving peninsula 4026 of an adjacent pocket 4006. Similar to the pockets 3906 in the anvil 3900, the geometry of the pockets 4006 facilitates the close arrangement of the pockets 4006 in the staple-forming surface 4002. The “forming ratio” is the ratio of the non-forming portion 4008 to the forming portion, i.e., the pockets 4006. In various instances, the forming ratio can be at least 1:1, for example

Referring now to FIGS. 93-96C, staple-forming pockets 4106 in a portion of an anvil 4100 are depicted. The pockets 4106 and arrangement thereof in the anvil 4100 are similar in many aspects to the pockets 4006 and arrangement thereof in the anvil 4000. For example, the anvil 4100 includes a staple-forming surface 4102 and a longitudinal slot 4104. The longitudinal slot 4104 extends along the longitudinal axis LA of the anvil 4100. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 4104 during at least a portion of a firing stroke. Staple-forming pockets 4106 are defined in the staple-forming surface 4102. The staple-forming surface 4102 also includes a non-forming portion 4108 that extends around the pockets 4106. The non-forming portion 4108 extends entirely around each pocket 4106 in FIG. 90 . In other words, the non-forming portion 4108 surrounds the staple-forming pockets 4106. In other instances, at least a portion of two or more adjacent pockets 4106 can be in abutting contact such that a non-forming portion 4108 is not positioned therebetween.

The forming ratio of the staple-forming surface 4102 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 4108 of the anvil 4100 can be minimized with respect to the staple-forming pockets 4106. Additionally or alternatively, the footprint of the staple-forming pockets 4106 can be extended or enlarged to maximize the portion of the staple-forming surface 4102 that is designed to catch and form the staples.

The pockets 4106 depicted in FIG. 93 are arranged in an inner row 4114 a, an intermediate row 4114 b, and an outer row 4114 c on a first side of the longitudinal slot 4104. Inner pockets 4106 a are positioned in the inner row 4114 a, intermediate pockets 4106 b are positioned in the intermediate row 4114 b, and outer pockets 4106 c are positioned in the outer row 4114 c. Similar to the anvil 3800, the pockets 4106 are arranged in a herringbone arrangement along the staple-forming surface 4102 of the anvil 4100. Although not shown in FIG. 93 , in at least one instance, the pockets 4106 on the opposing side of the slot 4104 can form a mirror image reflection of the pockets 4106 on the first side of the longitudinal slot 4104. In other instances, the arrangement of pockets 4106 in the staple-forming surface 4102 can be asymmetrical relative to the slot 4104 and, in certain instances, the anvil 4100 may not include the longitudinal slot 4104. In various instances, the pockets 4106 can be arranged in less than or more than three rows on each side of the slot 4104.

The pockets 4106 depicted in FIG. 93 are identical. Each pocket 4106 defined in the staple-forming surface 4102 has the same geometry. In other instances, the geometry of the pockets 4106 can vary row-to-row and/or longitudinally along the length of the anvil 4100. For example, in certain instances, the depth of the pockets 4106 or portions thereof can vary along the length of the anvil 4100 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 4106 b is shown in FIGS. 94-96C. The pocket 4106 b has a first end, or proximal end, 4110 and a second end, or distal end, 4112. A pocket axis PA (FIG. 94 ) extends between the proximal end 4110 and the distal end 4112 of the pocket 4106 b. The pocket 4106 b includes a perimeter 4116, which defines the boundary of the pocket 4106 b. The pocket 4106 also includes a proximal cup 4120, a distal cup 4122, and a neck portion 4124 connecting the proximal cup 4120 and the distal cup 4122. When a staple is driven into forming contact with the staple-forming surface 4102, the proximal cup 4120 is aligned with a proximal staple leg, and the distal cup 4122 is aligned with a distal staple leg. The cups 4120, 4122 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 4106, such as the neck portion 4124, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 95 , each cup 4120, 4122 of the pocket 4106 b defines an entrance ramp 4140 and an exit ramp 4142. The exit ramp 4142 is steeper than the entrance ramp 4140. When forming a staple, the tip of a staple leg can enter the respective cup 4120, 4122 along the entrance ramp 4140 and exit the respective cup 4120, 4122 along the exit ramp 4142. At an apex 4146 between the entrance ramp 4140 and the exit ramp 4142, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 4106 b also defines a bridge 4144 in the neck portion 4124 between the proximal cup 4120 and the distal cup 4122. The bridge 4144 is offset from the non-forming portion 4108. More specifically, the bridge 4144 is positioned below or recessed relative to the non-forming portion 4108.

Referring primarily to FIGS. 96-96C, the pocket 4106 b includes sidewalls 4150, which are oriented perpendicular to the non-forming portion 4108 of the staple-forming surface 4102. The sidewalls 4150 narrow from the outer ends of each cup 4120, 4122 toward the neck portion 4124. Consequently, the widest portion of the cups 4120 and 4122 is at the proximal and distal ends 4110 and 4112, respectively, of the pocket 4106 b. The profile 4116 of the pocket 4106 b defines a bow-tie shape perimeter. The widened region at the proximal and distal ends 4110, 4112 provides an enlarged footprint for receiving the tip of a staple leg. In various instances, the widened portions of the cups 4120, 4122 define extended landing zones for receiving the staple tips. As the cups 4120, 4122 narrow toward the neck portion 4124, the cups 4120, 4122 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration.

Referring again to FIG. 96A-96C, the pocket 4106 b defines a chamfered edge 4154 along the sides of the pocket 4106 b. Additionally, the pocket 4106 b includes a groove 4156 in the bottom surface 4158 thereof. The groove 4156 is defined in the proximal cup 4120 and the distal cup 4122. In the depicted embodiment, the groove 4156 does not extend across the bridge 4144 of the pocket 4106 b. The groove 4156 is configured to constrain and guide the staple legs as they move to the deformed configuration. For example, the staple legs can slide through the groove 4156 as the staples move along at least a portion of the entrance ramp 4140 and the exit ramp 4142. In various instances, the diameter of the groove 4156 can be less than the diameter of the staple engaged with the groove 4156. In end effectors in which different staple geometries are utilized with the same staple-forming pocket geometry, the width of the groove in the pocket can be less than the smallest diameter staple. In various instances, the staple legs are deformed toward the staple base before reaching the bridge 4144 and, thus, do not engage the bridge 4144 of the pocket 4106 b.

Referring again to FIG. 94 , the pocket 4106 b is symmetric about the pocket axis PA. For example, the perimeter 4116 of the pocket 4106 b is symmetric about the pocket axis PA. Moreover, the pocket 4106 b is symmetric about a central axis CA through the neck portion 4124 and perpendicular to the pocket axis PA. For example, the perimeter 4116 of the pocket 4106 b is symmetric about the central axis CA, and the proximal cup 4120 has the same geometry as the distal cup 4122. In other instances, the proximal cup 4120 can be different than the distal cup 4122. For example, referring again to FIG. 91 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 94 , the neck portion 4124 of the pocket 4106 b is narrower than the proximal and distal cups 4120 and 4122. The narrowed perimeter 4116 of the pocket 4106 b defines a receiving peninsula 4126 between a portion of the proximal cup 4120 and a portion of the distal cup 4122. Owing to the symmetry of the pocket 4106 b, symmetrical receiving peninsulas 4126 are positioned on each side of the pocket 4106 b. The receiving peninsulas 4126 are bounded by the perimeter 4116 of the pocket 4106 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portion of the proximal and distal cups 4120 and 4122 on a side of the pocket 4106 b. A first tangent axis T_(B1) is positioned on a first side of the pocket 4106 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 4106 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 94 are parallel to the pocket axis PA.

Referring again to FIG. 93 , each pocket 4106 extends toward the receiving peninsula 4126 of an adjacent pocket 4106. For example, the intermediate pockets 4106 b are aligned with the neck portion 4124 of the inner pockets 4106 a and the outer pockets 4106 c. Moreover, the inner pockets 4106 a and the outer pockets 4106 b extend toward the receiving peninsula 4126 of one of the intermediate pockets 4106 b. More specifically, the inner pockets 4106 a are aligned with the neck portion 4124 of an adjacent intermediate pocket 4106 b, and the outer pockets 4106 c are aligned with the neck portion 4124 of an adjacent intermediate pocket 4106 b. In certain instances, a portion of the pockets 4106 can extend into the receiving peninsula 4126 of an adjacent pocket 4106. Similar to the pockets 3906 in the anvil 3900, the geometry of the pockets 4106 facilitates the close arrangement of the pockets 4106 in the staple-forming surface 4102. The “forming ratio” is the ratio of the non-forming portion 4108 to the forming portion, i.e., the pockets 4106. In various instances, the forming ratio can be at least 1:1, for example.

Referring now to FIGS. 97-100C, staple-forming pockets 4206 in a portion of an anvil 4200 are depicted. The pockets 4206 and arrangement thereof in the anvil 4200 are similar in many aspects to the pockets 4106 and arrangement thereof in the anvil 4100. For example, the anvil 4200 includes a staple-forming surface 4202 and a longitudinal slot 4204. The longitudinal slot 4204 extends along the longitudinal axis LA of the anvil 4200. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 4204 during at least a portion of a firing stroke. The staple-forming pockets 4206 are defined in the staple-forming surface 4202. The staple-forming surface 4202 also includes a non-forming portion 4208 that extends around the pockets 4206. The non-forming portion 4208 extends entirely around each pocket 4206 in FIG. 97 . In other words, the non-forming portion 4208 surrounds the staple-forming pockets 4206. In other instances, at least a portion of two or more adjacent pockets 4206 can be in abutting contact such that a non-forming portion 4208 is not positioned therebetween.

The forming ratio of the staple-forming surface 4202 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 4208 of the anvil 4200 can be minimized with respect to the staple-forming pockets 4206. Additionally or alternatively, the footprint of the staple-forming pockets 4206 can be extended or enlarged to maximize the portion of the staple-forming surface 4202 that is designed to catch and form the staples.

The pockets 4206 depicted in FIG. 97 are arranged in an inner row 4214 a, an intermediate row 4214 b, and an outer row 4214 c on a first side of the longitudinal slot 4204. Inner pockets 4206 a are positioned in the inner row 4214 a, intermediate pockets 4206 b are positioned in the intermediate row 4214 b, and outer pockets 4206 c are positioned in the outer row 4214 c. Similar to the anvil 3800, the pockets 4206 are arranged in a herringbone arrangement along the staple-forming surface 4202 of the anvil 4200. Although not shown in FIG. 97 , in at least one instance, the pockets 4206 on the opposing side of the slot 4204 can form a mirror image reflection of the pockets 4206 on the first side of the longitudinal slot 4204. In other instances, the arrangement of pockets 4206 in the staple-forming surface 4202 can be asymmetrical relative to the slot 4204 and, in certain instances, the anvil 4200 may not include the longitudinal slot 4204. In various instances, the pockets 4206 can be arranged in less than or more than three rows on each side of the slot 4204.

The pockets 4206 depicted in FIG. 97 are identical. Each pocket 4206 defined in the staple-forming surface 4202 has the same geometry. In other instances, the geometry of the pockets 4206 can vary row-to-row and/or longitudinally along the length of the anvil 4200. For example, in certain instances, the depth of the pockets 4206 or portions thereof can vary along the length of the anvil 4200 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 4206 b is shown in FIGS. 98-100C. The pocket 4206 b has a first end, or proximal end, 4210 and a second end, or distal end, 4212. A pocket axis PA (FIG. 98 ) extends between the proximal end 4210 and the distal end 4212 of each pocket 4206. The pocket 4206 b includes a perimeter 4216, which defines the boundary of the pocket 4206 b. The pocket 4206 b also includes a proximal cup 4220, a distal cup 4222, and a neck portion 4224 connecting the proximal cup 4220 and the distal cup 4222. When a staple is driven into forming contact with the staple-forming surface 4202, the proximal cup 4220 is aligned with a proximal staple leg, and the distal cup 4222 is aligned with a distal staple leg. The cups 4220, 4222 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 4206, such as the neck portion 4224, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 99 , each cup 4220, 4222 of the pocket 4206 b defines an entrance ramp 4240 and an exit ramp 4242. The exit ramp 4242 is steeper than the entrance ramp 4240. When forming a staple, the tip of a staple leg can enter the respective cup 4220, 4222 along the entrance ramp 4240 and exit the respective cup 4220, 4222 along the exit ramp 4242. At an apex 4246 between the entrance ramp 4240 and the exit ramp 4242, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 4206 b also defines a bridge 4244 between the proximal cup 4220 and the distal cup 4222. The bridge 4244 is offset from the non-forming portion 4208. More specifically, the bridge 4244 is positioned below or recessed relative to the non-forming portion 4208.

Referring primarily to FIGS. 100A-100C, the pocket 4206 b includes sidewalls 4250, which are oriented perpendicular to the non-forming portion 4208 of the staple-forming surface 4202. The sidewalls 4250 narrow toward the neck portion 4224. Consequently, the widest portion of the cups 4220, 4222 is at the proximal and distal ends of the sidewalls 4250. The widened region provides an enlarged footprint for receiving the tip of a staple leg. As the cups 4220, 4222 narrow toward the neck portion 4224, the cups 4220, 4222 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration.

The cups 4220, 4222 also include extended landing zones 4230, 4232, respectively, which further enlarge the footprint of the cups 4220, 4222. The proximal extended landing zone 4230 extends proximally along the pocket axis PA, and the distal extended landing zone 4232 extends distally along the pocket axis PA. In the pocket 4206 b, the extended landing zones 4230 and 4232 define a substantially triangular perimeter. Moreover, the extended landing zones 4230 and 4232 terminate along the respective pocket axis PA at a corner. In other instances, the extended landing zones 4230 and 4232 can define straight or contoured perimeters, for example, and can extend laterally and/or longitudinally from the cups 4220 and 4222, for example.

Additionally, the pocket 4206 b includes a trough 4256 in the bottom surface thereof. The trough 4256 is configured to constrain and guide the staple legs as they move to the deformed configuration. In the depicted embodiment, the trough 4256 spans between the sidewalls 4250 and defines the entire bottom surface of the pocket 4206 b. The trough 4256 extends from the proximal cup 4220 over the bridge 4224 and into the distal cup 4222. In other instances, the trough 4256 may not extend across the bridge 4244 of the pocket 4206 b. The trough 4256 includes two ramped surfaces 4256 a and 4256 b that extend downward away from the non-forming portion 4208 and meet along the pocket axis PA (FIG. 98 ). As depicted in FIGS. 100A-100C, the trough 4256 defines a steeper gradient along the bridge 4244 than in the cups 4220, 4222. In other instances, the gradient can be uniform along the length of the trough 4256 and/or can be steeper in the cups 4220, 4222 than along the bridge 4244, for example.

Still referring to FIGS. 100A-100C, the pocket 4206 b also defines a chamfered edge 4254 along the sides of the pocket 4206 b. In the pocket 4206 b, the chamfered edge 4254 defines the overall width of the pocket 4206 b. The overall width of the pocket 4206 b is uniform. For example, the width W_(A) (FIG. 100A) is equal to the width W_(B) (FIG. 100B) and the width W_(C) (FIG. 100C). In other instances, the widths W_(A), W_(B), and/or W_(C) may not be equal. Because the sidewalls 4250 narrow toward the neck portion 4224, the width of the chamfered edge 4254 correspondingly expands toward the neck portion 4224 to maintain the same overall pocket width. The pocket 4206 b also includes projections or knobs 4258 which extend toward the pocket axis PA at the neck portion 4224 of the pocket 4206 b. The knobs 4258 further narrow the neck portion 4224 to a width W_(N). The trough 4256 spans the bottom surface of the neck portion 4224 across the width W_(N).

Referring again to FIG. 98 , the pocket 4206 b is symmetric about the pocket axis PA. For example, the perimeter 4216 of the pocket 4206 b is symmetric about the pocket axis PA. Moreover, the pocket 4206 b is symmetric about a central axis CA through the neck portion 4224 and perpendicular to the pocket axis PA. For example, the perimeter 4216 of the pocket 4206 b is symmetric about the central axis CA, and the proximal cup 4220 has the same geometry as the distal cup 4222. In other instances, the proximal cup 4220 can be different than the distal cup 4222. For example, referring again to FIG. 99 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 97 , each pocket 4206 extends toward the neck portion 4224 of an adjacent pocket 4206. For example, the intermediate pockets 4206 b are aligned with the neck portions 4224 of the inner pockets 4206 a and the outer pockets 4206 c. More specifically, the proximal landing zones 4230 of the intermediate pockets 4206 b are aligned with the neck portion 4224 of an adjacent outer staple 4206 c, and the distal landing zones 4232 of the intermediate pockets 4206 b are aligned with the neck portion 4224 of an adjacent inner staple 4206 a. Moreover, the inner pockets 4206 a and the outer pockets 4206 b extend toward the neck portion 4224 of one of the intermediate pockets 4206 b. More specifically, the distal landing zones 4232 of the inner pockets 4206 a are aligned with the neck portion 4224 of an adjacent intermediate pocket 4206 b, and the proximal landing zones 4230 of the outer pockets 4206 c are aligned with the neck portion 4224 of an adjacent intermediate pocket 4206 b.

Referring now to FIGS. 101-104C, staple-forming pockets 4306 in a portion of an anvil 4300 are depicted. The pockets 4306 and arrangement thereof in the anvil 4300 are similar in many aspects to the pockets 3906 and arrangement thereof in the anvil 3900. For example, the anvil 4300 includes a staple-forming surface 4302 and a longitudinal slot 4304. The longitudinal slot 4304 extends along the longitudinal axis LA of the anvil 4300. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 4304 during at least a portion of a firing stroke. The staple-forming pockets 4306 are defined in the staple-forming surface 4302. The staple-forming surface 4302 also includes a non-forming portion 4308 that extends around the pockets 4306. The non-forming portion 4308 extends entirely around each pocket 4306 in FIG. 101 . In other words, the non-forming portion 4308 surrounds the staple-forming pockets 4306. In other instances, at least a portion of two or more adjacent pockets 4306 can be in abutting contact such that a non-forming portion 4308 is not positioned therebetween.

The forming ratio of the staple-forming surface 4302 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 4308 of the anvil 4300 can be minimized with respect to the staple-forming pockets 4306. Additionally or alternatively, the footprint of the staple-forming pockets 4306 can be extended or enlarged to maximize the portion of the staple-forming surface 4302 that is designed to catch and form the staples.

The pockets 4306 depicted in FIG. 101 are arranged in an inner row 4314 a, an intermediate row 4314 b, and an outer row 4314 c on a first side of the longitudinal slot 4304. Inner pockets 4306 a are positioned in the inner row 4314 a, intermediate pockets 4306 b are positioned in the intermediate row 4314 b, and outer pockets 4306 c are positioned in the outer row 4314 c. Similar to the anvil 3800, the pockets 4306 are arranged in a herringbone arrangement along the staple-forming surface 4302 of the anvil 4300. Although not shown in FIG. 101 , in at least one instance, the pockets 4306 on the opposing side of the slot 4304 can form a mirror image reflection of the pockets 4306 on the first side of the longitudinal slot 4304. In other instances, the arrangement of pockets 4306 in the staple-forming surface 4302 can be asymmetrical relative to the slot 4304 and, in certain instances, the anvil 4300 may not include the longitudinal slot 4304. In various instances, the pockets 4306 can be arranged in less than or more than three rows on each side of the slot 4304.

The pockets 4306 depicted in FIG. 101 are identical. Each pocket 4306 defined in the staple-forming surface 4302 has the same geometry. In other instances, the geometry of the pockets 4306 can vary row-to-row and/or longitudinally along the length of the anvil 4300. For example, in certain instances, the depth of the pockets 4306 or portions thereof can vary along the length of the anvil 4300 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 4306 b is shown in FIGS. 102-104C. The pocket 4306 b has a first end, or proximal end, 4310 and a second end, or distal end, 4312. A pocket axis PA (FIG. 102 ) extends between the proximal end 4310 and the distal end 4312 of the pocket 4306 b. The pocket 4306 b includes a perimeter 4316, which defines the boundary of the pocket 4306 b. The perimeter 4316 includes rounded corners at the proximal and distal ends of the pockets 4306. The pocket 4306 b also includes a proximal cup 4320, a distal cup 4322, and a neck portion 4324 connecting the proximal cup 4320 and the distal cup 4322. When a staple is driven into forming contact with the staple-forming surface 4302, the proximal cup 4320 is aligned with a proximal staple leg, and the distal cup 4322 is aligned with a distal staple leg. The cups 4320, 4322 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 4306, such as the neck portion 4324, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 103 , each cup 4320, 4322 of the pocket 4306 b defines an entrance ramp 4340 and an exit ramp 4342. The exit ramp 4342 is steeper than the entrance ramp 4340. When forming a staple, the tip of a staple leg can enter the respective cup 4320, 4322 along the entrance ramp 4340 and exit the respective cup 4320, 4322 along the exit ramp 4342. At an apex 4346 between the entrance ramp 4340 and the exit ramp 4342, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 4306 b also defines a bridge 4344 between the proximal cup 4320 and the distal cup 4322. The bridge 4344 is offset from the non-forming portion 4308. More specifically, the bridge 4344 is positioned below or recessed relative to the non-forming portion 4308.

Referring primarily to FIGS. 104A-104C, the pocket 4306 b includes sidewalls 4350, which are oriented perpendicular to the non-forming portion 4308 of the staple-forming surface 4302. The sidewalls 4350 narrow between the outer ends of each cup 4320, 4322 and the neck portion 4324. More specifically, the sidewalls 4350 extend along an inward contour to define a contour in the perimeter 4316 of the pocket 4306 b. The widest portion of the cups 4320, 4322 is at the proximal and distal ends of the sidewalls 4350. The widened region provides an enlarged footprint for receiving the tip of a staple leg. As the cups 4320, 4322 narrow toward the neck portion 4324, the cups 4320, 4322 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration.

The pocket 4306 b defines a chamfered edge 4354 along the sides of the pocket 4306 b. In the pocket 4306 b, the chamfered edge 4354 defines the overall width of the pocket 4306 b, which narrows toward the neck portion 4324. The pocket 4306 b also defines a fillet 4352 (FIGS. 104A-104C) between the sidewalls 4350 and the bottom surface 4358 the pocket 4306 b. The fillets 4352 are configured to guide the staple legs along the desired path in the pocket 4306 b. For example, if a staple leg lands along the chamfer 4352, the fillet corner 4352 can smoothly guide the staple leg toward the pocket axis PA.

Referring again to FIG. 102 , the pocket 4306 b is symmetric about the pocket axis PA. For example, the perimeter 4316 of the pocket 4306 b is symmetric about the pocket axis PA. Moreover, the pocket 4306 b is symmetric about a central axis CA through the neck portion 4324 and perpendicular to the pocket axis PA. For example, the perimeter 4316 of the pocket 4306 b is symmetric about the central axis CA, and the proximal cup 4320 has the same geometry as the distal cup 4322. In other instances, the proximal cup 4320 can be different than the distal cup 4322. For example, referring again to FIG. 103 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 102 , the neck portion 4324 of the pocket 4306 b is narrower than the proximal and distal cups 4320 and 4322. The narrowed perimeter 4316 of the pocket 4306 b defines a receiving peninsula 4326 between a portion of the proximal cup 4320 and a portion of the distal cup 4322. Owing to the symmetry of the pocket 4306 b, symmetrical receiving peninsulas 4326 are positioned on each side of the pocket 4306 b. The receiving peninsulas 4326 are bounded by the perimeter 4316 of the pocket 4306 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portion of the proximal and distal cups 4320 and 4322 on a side of the pocket 4306 b. A first tangent axis T_(B1) is positioned on a first side of the pocket 4306 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 4306 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 102 are parallel to the pocket axis PA.

Referring again to FIG. 101 , each pocket 4306 extends toward the receiving peninsula 4326 of an adjacent pocket 4306. For example, the intermediate pockets 4306 b are aligned with the neck portions 4324 of the inner pockets 4306 a and the outer pockets 4306 c. Moreover, the inner pockets 4306 a and the outer pockets 4306 b extend toward the receiving peninsula 4326 of one of the intermediate pockets 4306 b. More specifically, the inner pockets 4306 a are aligned with the neck portion 4324 of an adjacent intermediate pocket 4306 b, and the outer pockets 4306 c are aligned with the neck portion 4324 of an adjacent intermediate pocket 4306 b. In certain instances, a portion of the pockets 4306 can extend into the receiving peninsula 4326 of an adjacent pocket 4306. Similar to the pockets 3906 in the anvil 3900, the geometry of the pockets 4306 facilitates the close arrangement of the pockets 4306 in the staple-forming surface 4302. The “forming ratio” is the ratio of the non-forming portion 4308 to the forming portion, i.e., the pockets 4306. In at least one instance, the forming ratio can be at least 1:1, for example.

Referring now to FIGS. 105-108C, staple-forming pockets 4406 in a portion of an anvil 4400 are depicted. The pockets 4406 and arrangement thereof in the anvil 4400 are similar in many aspects to the pockets 4306 and arrangement thereof in the anvil 4300. For example, the anvil 4400 includes a staple-forming surface 4402 and a longitudinal slot 4404. The longitudinal slot 4404 extends along the longitudinal axis LA of the anvil 4400. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 4404 during at least a portion of a firing stroke. The staple-forming pockets 4406 are defined in the staple-forming surface 4402. The staple-forming surface 4402 also includes a non-forming portion 4408 that extends around the pockets 4406. The non-forming portion 4408 extends entirely around each pocket 4406 in FIG. 105 . In other words, the non-forming portion 4408 surrounds the staple-forming pockets 4406. In other instances, at least a portion of two or more adjacent pockets 4406 can be in abutting contact such that a non-forming portion 4408 is not positioned therebetween. Additionally, the non-forming portion 4406 extends through each pocket 4406, as described herein.

The forming ratio of the staple-forming surface 4402 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 4408 of the anvil 4400 can be minimized with respect to the staple-forming pockets 4406. Additionally or alternatively, the footprint of the staple-forming pockets 4406 can be extended or enlarged to maximize the portion of the staple-forming surface 4402 that is designed to catch and form the staples.

The pockets 4406 depicted in FIG. 105 are arranged in an inner row 4414 a, an intermediate row 4414 b, and an outer row 4414 c on a first side of the longitudinal slot 4404. Inner pockets 4406 a are positioned in the inner row 4414 a, intermediate pockets 4406 b are positioned in the intermediate row 4414 b, and outer pockets 4406 c are positioned in the outer row 4414 c. Similar to the anvil 3800, the pockets 4406 are arranged in a herringbone arrangement along the staple-forming surface 4402 of the anvil 4400. Although not shown in FIG. 105 , in at least one instance, the pockets 4406 on the opposing side of the slot 4404 can form a mirror image reflection of the pockets 4406 on the first side of the longitudinal slot 4404. In other instances, the arrangement of pockets 4406 in the staple-forming surface 4402 can be asymmetrical relative to the slot 4404 and, in certain instances, the anvil 4400 may not include the longitudinal slot 4404. In various instances, the pockets 4406 can be arranged in less than or more than three rows on each side of the slot 4404.

The pockets 4406 depicted in FIG. 105 are identical. Each pocket 4406 defined in the staple-forming surface 4402 has the same geometry. In other instances, the geometry of the pockets 4406 can vary row-to-row and/or longitudinally along the length of the anvil 4400. For example, in certain instances, the depth of the pockets 4406 or portions thereof can vary along the length of the anvil 4400 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 4406 b is shown in FIGS. 106-108C. The pocket 4406 b has a first end, or proximal end, 4410 and a second end, or distal end, 4412. A pocket axis PA (FIG. 106 ) extends between the proximal end 4410 and the distal end 4412 of the pocket 4406 b. The pocket 4406 b includes a perimeter 4416, which defines the boundary of the pocket 4406 b. The perimeter 4416 includes rounded corners at the proximal and distal ends 4410 and 4412 of the pocket 4406 b. The pocket 4406 b also includes a proximal cup 4420 and a distal cup 4422. A portion of the non-forming portion 4408 extends between the proximal cup 4420 and the distal cup 4422. In other words, the pocket 4406 b includes two separate and discrete cups 4420 and 4422 in the staple-forming surface 4402. When a staple is driven into forming contact with the staple-forming surface 4402, the proximal cup 4420 is aligned with a proximal staple leg, and the distal cup 4422 is aligned with a distal staple leg. The cups 4420, 4422 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 4406 and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 107 , each cup 4420, 4422 of the pocket 4406 b defines an entrance ramp 4440 and an exit ramp 4442. The exit ramp 4442 is steeper than the entrance ramp 4440. When forming a staple, the tip of a staple leg can enter the respective cup 4420, 4422 along the entrance ramp 4440 and exit the respective cup 4420, 4422 along the exit ramp 4442. At an apex 4446 between the entrance ramp 4440 and the exit ramp 4442, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 4406 b also defines a bridge 4444 between the proximal cup 4420 and the distal cup 4422. The bridge 4444 is aligned with the non-forming portion 4408. More specifically, the bridge 4444 is a planar extension of the non-forming portion 4408, which extends between the proximal and distal cups 4420, 4422.

Referring primarily to FIGS. 108A-108C, the pocket 4406 b includes sidewalls 4450, which are oriented at an angle relative to the non-forming portion 4408 of the staple-forming surface 4402. More specifically, the sidewalls 4450 are obliquely oriented relative to the non-forming portion 4408. Moreover, the angular orientation of the sidewalls 4450 is constant along the length of the cups. For example, the angles A, B, and C depicted in FIGS. 108A, 108B, and 108C, respectively, are equal. In other instances, one of more of the angles A, B, and C can be different. The sidewalls 4450 narrow between the outer ends of each cup 4420, 4422 and inner ends of the cups 4420, 4422. More specifically, the sidewalls 4450 extend along an inward contour to define a contour in the perimeter 4416 of the pocket 4406 b. The widest portion of the cups 4420, 4422 is at the proximal and distal ends of the pocket 4406 b. The widened region provides an enlarged footprint for receiving the tip of a staple leg. As the cups 4420, 4422 narrow toward the bridge 4444, the cups 4420, 4422 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration.

The pocket 4406 b defines a fillet 4452 (FIGS. 108A-108C) between the sidewalls 4450 and the bottom surface 4458 of the pocket 4406 b. The fillets 4452 are configured to guide the staple legs along the desired path in the pocket 4406 b. For example, if a staple leg lands along the fillet 4452, the fillet 4452 can smoothly guide the staple leg toward the pocket axis PA.

Referring again to FIG. 106 , the pocket 4406 b is symmetric about the pocket axis PA. For example, the perimeter 4416 of the pocket 4406 b is symmetric about the pocket axis PA. Moreover, the pocket 4406 b is symmetric about a central axis CA between the proximal and distal cups 4420 and 4422 and perpendicular to the pocket axis PA. For example, the perimeter 4416 of the pocket 4406 b is symmetric about the central axis CA, and the proximal cup 4420 has the same geometry as the distal cup 4422. In other instances, the proximal cup 4420 can be different than the distal cup 4422. For example, referring again to FIG. 107 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 106 , the central portion of the pocket 4406 b is narrower than the proximal and distal ends 4410 and 4412 of the cups 4420 and 4422, respectively. The narrowed perimeter 4416 of the pocket 4406 b defines a receiving peninsula 4426 between a portion of the proximal cup 4420 and a portion of the distal cup 4422. Owing to the symmetry of the pocket 4406 b, symmetrical receiving peninsulas 4426 are positioned on each side of the pocket 4406 b. The receiving peninsulas 4426 are bounded by the perimeter 4416 of the pocket 4406 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portion of the proximal and distal cups 4420 and 4422 on a side of the pocket 4406 b. A first tangent axis T_(B1) is positioned on a first side of the pocket 4406 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 4406 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 106 are parallel to the pocket axis PA.

Referring again to FIG. 105 , each pocket 4406 extends toward the receiving peninsula 4426 of an adjacent pocket 4406. For example, the intermediate pockets 4406 b are aligned with the central portion of the inner pockets 4406 a and the outer pockets 4406 c. Moreover, the inner pockets 4406 a and the outer pockets 4406 b extend toward the receiving peninsula 4426 of one of the intermediate pockets 4406 b. More specifically, the inner pockets 4406 a are aligned with the central portion of an adjacent intermediate pocket 4406 b, and the outer pockets 4406 c are aligned with the central portion of an adjacent intermediate pocket 4406 b. In certain instances, a portion of the pockets 4406 can extend into the receiving peninsula 4426 of an adjacent pocket 4406. Similar to the pockets 3906 in the anvil 3900, the geometry of the pockets 4406 facilitates the close arrangement of the pockets 4406 in the staple-forming surface 4402. The “forming ratio” of the staple-forming surface 4402 is the ratio of the non-forming portion 4408 to the forming portion, i.e., the pockets 4406. The forming ratio of the staple-forming surface 4402 is about 2.56:1. In other instances, the forming ratio can be less than 2.56:1 or more than 2.56:1. For example, in at least one instance, more than 50% of the staple-forming surface 4402 can be covered with staple-forming pockets 4406.

Referring now to FIGS. 109-112C, staple-forming pockets 4506 in a portion of an anvil 4500 are depicted. The pockets 4506 and arrangement thereof in the anvil 4500 are similar in many aspects to the pockets 3906 and arrangement thereof in the anvil 3900. For example, the anvil 4500 includes a staple-forming surface 4502 and a longitudinal slot 4504. The longitudinal slot 4504 extends along the longitudinal axis LA of the anvil 4500. In certain instances, a firing element and/or cutting element can translate through the longitudinal slot 4504 during at least a portion of a firing stroke. The staple-forming pockets 4506 are defined in the staple-forming surface 4502. The staple-forming surface 4502 also includes a non-forming portion 4508 that extends around the pockets 4506. The non-forming portion 4508 extends entirely around each pocket 4506 in FIG. 109 . In other words, the non-forming portion 4508 surrounds the staple-forming pockets 4506. In other instances, at least a portion of two or more adjacent pockets 4506 can be in abutting contact such that a non-forming portion 4508 is not positioned therebetween.

The forming ratio of the staple-forming surface 4502 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 4508 of the anvil 4500 can be minimized with respect to the staple-forming pockets 4506. Additionally or alternatively, the footprint of the staple-forming pockets 4506 can be extended or enlarged to maximize the portion of the staple-forming surface 4502 that is designed to catch and form the staples.

The pockets 4506 depicted in FIG. 109 are arranged in an inner row 4514 a, an intermediate row 4514 b, and an outer row 4514 c on a first side of the longitudinal slot 4504. Inner pockets 4506 a are positioned in the inner row 4514 a, intermediate pockets 4506 b are positioned in the intermediate row 4514 b, and outer pockets 4506 c are positioned in the outer row 4514 c. Similar to the anvil 3800, the pockets 4506 are arranged in a herringbone arrangement along the staple-forming surface 4502 of the anvil 4500. Although not shown in FIG. 109 , in at least one instance, the pockets 4506 on the opposing side of the slot 4504 can form a mirror image reflection of the pockets 4506 on the first side of the longitudinal slot 4504. In other instances, the arrangement of pockets 4506 in the staple-forming surface 4502 can be asymmetrical relative to the slot 4504 and, in certain instances, the anvil 4500 may not include the longitudinal slot 4504. In various instances, the pockets 4506 can be arranged in less than or more than three rows on each side of the slot 4504.

The pockets 4506 depicted in FIG. 109 are identical. Each pocket 4506 defined in the staple-forming surface 4502 has the same geometry. In other instances, the geometry of the pockets 4506 can vary row-to-row and/or longitudinally along the length of the anvil 4500. For example, in certain instances, the depth of the pockets 4506 or portions thereof can vary along the length of the anvil 4500 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary pocket 4506 b is shown in FIGS. 110-112C. The pocket 4506 b has a first end, or proximal end, 4510 and a second end, or distal end, 4512. A pocket axis PA (FIG. 110 ) extends between the proximal end 4510 and the distal end 4512 of the pocket 4506 b. The pocket 4506 b includes a perimeter 4516, which defines the boundary of the pocket 4506 b. Similar to the pockets 4306, the perimeter 4516 includes rounded corners at the proximal and distal ends 4510 and 4512 of the pocket 4506 b. The pocket 4506 b also includes a proximal cup 4520, a distal cup 4522, and a neck 4524 extending between the proximal cup 4520 and the distal cup 4522. When a staple is driven into forming contact with the staple-forming surface 4502, the proximal cup 4520 is aligned with a proximal staple leg, and the distal cup 4522 is aligned with a distal staple leg. The cups 4520, 4522 are configured to direct or funnel the staple legs toward the pocket axis PA and a central portion of the pocket 4506, such as the neck 4524, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 111 , each cup 4520, 4522 of the pocket 4506 b defines an entrance ramp 4540 and an exit ramp 4542. The entrance ramp 4540 is steeper than the exit ramp 4542. When forming a staple, the tip of a staple leg can enter the respective cup 4520, 4522 along the entrance ramp 4540 and exit the respective cup 4520, 4522 along the exit ramp 4542. At an apex 4546 between the entrance ramp 4540 and the exit ramp 4542, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 4506 b also defines a bridge 4544 between the proximal cup 4520 and the distal cup 4522. The bridge 4544 is offset from the non-forming portion 4508. More specifically, the bridge 4544 is positioned below or recessed relative to the non-forming portion 4508.

Referring primarily to FIGS. 112A-112C, the pocket 4506 b includes contoured or arced walls 4550. The walls 4550 form each cup 4520, 5422 into a wide, rounded basin for receiving and forming the staple legs. Additionally, the pocket 4506 b includes a groove 4556 along the bottom surface. The walls 4550 arc downward into the anvil 4500 between the non-forming surface 4508 and the groove 4556. For example, the sidewalls 4550 seamlessly transition to a bottom surface of the pocket 4506 b. The groove 4556 extends along the bottom surface from the proximal cup 4520 over the bridge 4524 and into the distal cup 4522. The groove 4556 is configured to constrain and guide the staple legs as they move to the deformed configuration. In various instances, the diameter of the groove 4556 can be less than the diameter of the staple engaged with the groove 4556. In end effectors in which different staple geometries are utilized with the same staple-forming pocket geometry, the width of the groove in the pocket can be less than the smallest diameter staple.

The contoured walls 4550 narrow between the outer ends of each cup 4520, 4522 and the neck 4524. More specifically, the walls 4550 extend along an inward contour to define a contour in the perimeter 4516 of the pocket 4506 b. The widened region provides an enlarged footprint for receiving the tip of a staple leg. As the cups 4520, 4522 narrow toward the bridge 4544, the cups 4520, 4522 are configured to funnel and/or guide the tips of the staple legs toward and/or along the pocket axis PA and into a formed configuration.

The pocket 4506 b also defines a chamfered edge 4554 along a portion of the sides of the pocket 4506 b. As the sidewalls 4550 narrow toward the neck portion 4524, the width of the chamfered edge 4554 correspondingly expands toward the neck portion 4224 to maintain the overall pocket width.

Referring again to FIG. 110 , the pocket 4506 b is symmetric about the pocket axis PA. For example, the perimeter 4516 of the pocket 4406 b is symmetric about the pocket axis PA. Moreover, the pocket 4506 b is symmetric about a central axis CA through the neck portion 4524 and perpendicular to the pocket axis PA. For example, the perimeter 4516 of the pocket 4506 b is symmetric about the central axis CA, and the proximal cup 4520 has the same geometry as the distal cup 4522. In other instances, the proximal cup 4520 can be different than the distal cup 4522. For example, referring again to FIG. 111 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein.

Referring again to FIG. 109 , each pocket 4506 extends toward the neck portion 4524 of an adjacent pocket 4506. For example, the intermediate pockets 4506 b are aligned with the neck portions 4524 of the inner pockets 4506 a and the outer pockets 4506 c. Moreover, the inner pockets 4506 a and the outer pockets 4506 b extend toward the neck portion 4524 of one of the intermediate pockets 4506 b.

Staple-forming pockets can include extended landing zones for receiving the tips of the staple legs when the staples are fired into forming contact with the anvil. In certain instances, the extended landing zones can extend laterally and/or longitudinally from the cups of the staple-forming pockets, as described herein. The profile, or perimeter, of the staple-forming pockets can nest with the profile, or perimeter, of one or more adjacent staple-forming pockets. For example, at least a portion of the perimeter of a staple-forming pocket can extend along a contour or path that matches, tracks, follows and/or parallels a portion of the perimeter of one or more adjacent staple-forming pockets. Such tracking portions or adjacent perimeters can define concentric profiles.

In various instances, the surface area of a staple-forming pocket having one or more extended landing zones can be greater than the surface area of a staple-forming pocket without the one or more extended landing zones. For example, extended landing zones can increase the surface area of a staple-forming pocket by at least 10%. Extended landing zones can increase the surface area of a staple-forming pocket by 15% or 25%, for example. In other instances, extended landing zones can increase the surface area of a staple-forming pocket by less than 10%, such as 5%, for example. Certain staple-forming pockets described herein can have a greater surface area than the staple-forming pockets in an anvil having six rows of parallel staple-forming pockets but that is otherwise identical to certain anvils described herein having six rows of angularly-oriented staple-forming pockets. In still other instances, a staple-forming pocket having extended landing zones may also include narrowed and/or otherwise reduced portions having a surface area that is equal to or greater than the surface area of the extended landing zones.

In certain instances, the staple-forming pockets can be asymmetrical. For example, the staple-forming pockets can be asymmetrical relative to a pocket axis extending between a proximal end and a distal end of the pocket and/or can be asymmetrical relative to a central axis extending perpendicular to the pocket axis and transecting a central portion of the pocket. The asymmetry of the staple-forming pockets can facilitate nesting of the pockets and/or can maximize the surface area of the pockets in a staple-forming surface, for example.

Referring now to FIGS. 113-116C, staple-forming pockets 5006 in a portion of an anvil 5000 are depicted. Similar to the anvil 3800, the pockets 5006 are arranged in a herringbone arrangement along the staple-forming surface 5002 of the anvil 5000. The anvil 5000 includes a staple-forming surface 5002 and a longitudinal slot 5004. The longitudinal slot 5004 extends along the longitudinal axis LA of the anvil 5000. In certain instances, a firing element and/or a cutting element can translate through the longitudinal slot 5004 during at least a portion of a firing stroke. The staple-forming pockets 5006 are defined in the staple-forming surface 5002. The staple-forming surface 5002 also includes a non-forming portion 5008 that extends around the pockets 5006. The non-forming portion 5008 extends entirely around each pocket 5006. In other words, the non-forming portion 5008 surrounds the staple-forming pockets 5006. In other instances, at least a portion of two or more adjacent pockets 5006 can be in abutting contact such that a non-forming portion 5008 is not positioned therebetween.

The forming ratio of the staple-forming surface 5002 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 5008 of the anvil 5000 can be minimized with respect to the staple-forming pockets 5006. Additionally or alternatively, the footprint of the staple-forming pockets 5006 can be extended or enlarged to maximize the portion of the staple-forming surface 5002 that is designed to catch and form the staples.

The pockets 5006 depicted in FIG. 113 are arranged in an inner row 5014 a, an intermediate row 5014 b, and an outer row 5014 c on a first side of the longitudinal slot 5004. Inner pockets 5006 a are positioned in the inner row 5014 a, intermediate pockets 5006 b are positioned in the intermediate row 5014 b, and outer pockets 5006 c are positioned in the outer row 5014 c. Although not shown in FIG. 113 , in at least one instance, the pockets 5006 on the opposing side of the slot 5004 can form a mirror image reflection of the pockets 5006 on the first side of the longitudinal slot 5004. In other instances, the arrangement of pockets 5006 in the staple-forming surface 5002 can be asymmetrical relative to the slot 5004 and, in certain instances, the anvil 5000 may not include the longitudinal slot 5004. In various instances, the pockets 5006 can be arranged in less than or more than three rows on each side of the slot 5004.

The inner pockets 5006 a are identical, the intermediate pockets 5006 b are identical, and the outer pockets 5006 c are identical; however, the inner pockets 5006 a are different than the intermediate pockets 5006 b and the outer pockets 5006 c, and the intermediate pockets 5006 b are different than the outer pockets 5006 c. In other words, the pockets 5006 in each row 5014 a, 5014 b, and 5014 c are different. Extended landing zones 5030 and 5032 of the pockets 5006 a, 5006 b, and 5006 c, which are described herein, contribute to the different geometries thereof. The shape and size of the extended landing zones 5030 and 5032 are confined by the perimeter 5016 of adjacent, nested pockets 5006.

Although the pockets 5006 in each row 5014 a, 5014 b, and 5014 c are different, the pockets 5006 can be configured to form staples to the same, or substantially the same, formed shape. In other instances, the pockets 5006 can be configured to form staples to different formed shapes, such as to different heights and/or configurations. In certain instances, the pockets 5006 can vary longitudinally within each row 5014 a, 5014 b, and 5014 c. For example, in certain instances, the depth of the pockets 5006 or portions thereof can vary along the length of the anvil 5000 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

In certain instances, the pockets 5006 can be configured to engage different geometry staples. For example, staples having different unformed heights and/or different diameters can be formed by the pockets 5006 in the anvil 5000. In certain instances, the geometry of the staples can vary longitudinally, and the pockets 5006 can be configured to form the different geometry staples. For example, the unformed height of the staples and/or the wire diameter can vary along the length of the anvil 5000.

An exemplary intermediate pocket 5006 b is shown in FIGS. 113-116C. The pocket 5006 b has a first end, or proximal end, 5010 and a second end, or distal end, 5012. A pocket axis PA (FIG. 114 ) extends between the proximal end 5010 and the distal end 5012 of the pocket 5006 b. The pocket 5006 b includes a perimeter 5016, which defines the boundary of the pocket 5006 b. The perimeter 5016 includes linear portions and contoured portions. More specifically, the perimeter 5016 includes linear portions and contoured corners therebetween at which the linear portions change directions. Referring again to FIG. 113 at least a portion of the perimeter 5016 of each pocket 5006 closely tracks or parallels at least a portion of the perimeter of one or more adjacent pockets 5006.

The pocket 5006 b includes a proximal cup 5020, a distal cup 5022, and a neck 5024 extending between the proximal cup 5020 and the distal cup 5022. When a staple is driven into forming contact with the staple-forming surface 5002, the proximal cup 5020 is aligned with a proximal staple leg, and the distal cup 5022 is aligned with a distal staple leg. The cups 5020 and 5022 are configured to direct or funnel the staple legs toward the pocket axis PA and the central portion of the pocket 5006, such as the neck portion 5024, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 115 , each cup 5020, 5022 of the pocket 5006 b defines an entrance ramp 5040 and an exit ramp 5042. When forming a staple, the tip of a staple leg can enter the respective pocket 5020, 5022 along the entrance ramp 5040 and exit the respective pocket 5020, 5022 along the exit ramp 5042. At an apex 5046 between the entrance ramp 5040 and the exit ramp 5042, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 5006 b also defines a bridge 5044 in the neck portion 5024 between the proximal cup 5020 and the distal cup 5022. The bridge 5044 is offset from the non-forming portion 5008. More specifically, the bridge 5044 is positioned below or recessed relative to the non-forming portion 5008.

Referring primarily to FIGS. 116A-116C, the pocket 5006 b includes sidewalls 5050, which extend from the non-forming portion 5008 to the bottom surface 5058. The sidewalls 5050 include linear portions and contoured portions. The sidewalls 5050 widen toward a central region 5021 (FIG. 114 ) of each cup 5020, 5022, and narrow from the central region 5021 of each cup 5020, 5022 toward the neck portion 5024. The widened central region 5021 provides an enlarged footprint for receiving the tip of a staple leg. As the cups 5020, 5022 narrow toward the neck 5024, the cups 5020, 5022 are configured to funnel and/or guide the staple legs and tips thereof toward and/or along the pocket axis PA and into a formed configuration.

FIG. 116A is taken along the plane ALL in FIG. 114 , which corresponds to the anticipated landing location (ALL) of a staple leg. For example, the tip of a staple leg can be expected to land in the proximal cup 5020 at and/or near the intersection of the plane ALL and the pocket axis PA. At the plane ALL, the pocket 5006 b defines a width W_(A) and a depth D_(A). The cross-section in FIG. 116B is taken across a transition between the proximal cup 5020 and the neck 5024. FIG. 116B depicts the pocket 5006 b defining a width W_(B) and a depth D_(B). The width W_(B) is less than the width W_(A), and the depth D_(B) is greater than the depth D_(A). In other words, the pocket 5006 b narrows and deepens from the plane ALL in the proximal cup 5020 toward the neck 5024. The comparatively large width W_(A) at the plane ALL is configured to provide a wide receptacle or basin for receiving the staple leg. The cross-section in FIG. 67C is taken across the neck portion 5024. FIG. 116C depicts the pocket 5006 b defining a width W_(C) and a depth D_(C). The width W_(C) is less than the width W_(B), and the depth D_(C) is less than the depth D_(B). In other words, the pocket 5006 b continues to narrow, and becomes shallower in the neck 5024 across the bridge 5044.

The bottom surface 5058 of the pocket 5006 b is a flat surface, which is bounded by an arcuate fillet 5059 therearound. In certain instances, the bottom surface 5058 can have a groove defined along at least a portion thereof. In other instances, the bottom surface 5058 can form a trough. In still other instances, the bottom surface can include hump or ridge along at least a portion thereof, such as across the bridge 5044, for example.

Referring primarily now to FIG. 114 , the pocket 5006 b includes a proximal extended landing zone 5030 and a distal extended landing zone 5032. The proximal extended landing zone 5030 is positioned in a proximal portion of the proximal cup 5020, and the distal extended landing zone 5032 is positioned in a distal portion of the distal cup 5022. More specifically, the extended landing zones 5030 and 5032 are positioned beyond the anticipated landing location of a staple. For example, the proximal extended landing zone 5030 is positioned proximal to the plane ALL and, in instances where the tip of a staple leg lands beyond the plane ALL, the proximal extended landing zones 5030 can catch the staple leg and direct it toward the pocket axis PA and/or toward the neck portion 5024. The landing zones 5030 and 5032 define a generally polygonal shape and, more specifically, a quadrilateral with rounded corners. In other instances, the landing zones 5030 and 5032 can be triangular or substantially triangular and, in still other instances, can define an arcuate or bulbous profile, for example.

The geometry of the extended landing zones 5030 and 5032 is constrained by the perimeter 5016 of the adjacent staple-forming pockets 5006. For example, the extended landing zones 5030 and 5032 can extend toward and/or into nearly abutting contact with one or more adjacent staple-forming pockets. The extended landing zones 5030 and 5032 and/or other portions of the pocket 5006 b can track and/or extend parallel to adjacent staple-forming pockets 5006. In other instances, the extended landing zones 5030 and 5032 can abut one or more adjacent staple-forming pockets 5006.

Referring again to FIG. 114 , the pocket 5006 b is asymmetric about the pocket axis PA. For example, the perimeter 5016 of the pocket 5006 b is asymmetric about the pocket axis PA. Moreover, the pocket 5006 b is asymmetric about a central axis CA through the neck portion 5024 and perpendicular to the pocket axis PA. For example, the perimeter 5016 of the pocket 5006 b is asymmetric about the central axis CA, and the proximal cup 5020 has a different geometry than the distal cup 5022. Although the proximal cup 5020 and the distal cup 5022 are different, the pocket 5006 b can be configured to form symmetric staples. For example, referring again to FIG. 115 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein. The formed height of the proximal and distal legs of a staple can be equal. In other instances, the pocket 5006 can be configured to form asymmetric staples.

Referring again to FIG. 114 , the neck portion 5024 is narrower than the proximal and distal cups 5020 and 5022. The narrowed perimeter 5016 of the pocket 5006 b at the neck portion 5024 defines a receiving peninsula 5026 between a portion of the proximal cup 5020 and a portion of the distal cup 5022. Receiving peninsulas 5026 are positioned on each side of the pocket 5006 b. The receiving peninsulas 5026 are bounded by the perimeter 5016 of the pocket 5006 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portions of the proximal and distal cups 5020 and 5022 on each side of the pocket 5006. A first tangent axis T_(B1) is positioned on a first side of the pocket 5006 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 5006 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 116 are parallel to the pocket axis PA. In other instances, one or both of the tangent axes T_(B1) and T_(B2) may not be parallel to the pocket axis PA.

Referring again to FIG. 113 , the perimeters 5016 of the pockets 5006 are nested or interlocked along the staple-forming surface 5002. In particular, each pocket 5006 extends into the receiving peninsula 5026 of an adjacent pocket 5006. For example, the intermediate pockets 5006 b are nested between the inner pockets 5006 a and the outer pockets 5006 c. Stated differently, the intermediate pockets 5006 b extend into the receiving peninsula 5026 of an adjacent inner pocket 5006 a and into the receiving peninsula 5026 of an adjacent outer pocket 5006 c. Moreover, the inner pockets 5006 a and the outer pockets 5006 b are nested with the intermediate pockets 5006 b. More specifically, the inner pockets 5006 a extend into the receiving peninsula 5026 of an adjacent intermediate pocket 5006 b, and the outer pockets 5006 c extend into the receiving peninsula 5026 of an adjacent intermediate pocket 5006 b. In various instances, the distal extended landing zone 5032 of the intermediate pocket 5006 b is positioned in the receiving peninsula 5026 of an inner pocket 5006 a, the proximal extended landing zone 5030 of the intermediate pocket 5006 b is positioned in the receiving peninsula 5026 of an outer pocket 5006 c, the distal extended landing zone 5032 of an inner pocket 5006 a is positioned in the receiving peninsula 5026 of an intermediate pocket 5006 b, and the proximal extended landing zone 5030 of the outer pocket 5006 c is positioned in the receiving peninsula 5026 of an intermediate pocket 5006 b.

The geometry of the pockets 5006 facilitates the nesting of the pockets 5006 in the staple-forming surface 5002. For example, because the pockets 5006 include a narrowed neck portion 5024 between two enlarged cups 5020 and 5022, one of the enlarged cups 5020, 5022 of another pocket 5006 can be positioned adjacent to the narrowed neck portion 5024. For example, one of the enlarged cups 5020, 5022 can be aligned with and/or received by a portion of an adjacent pocket 5006. In such instances, the surface area of the staple-forming surface 5002 that is covered by the pockets 5006 can be optimized. The “forming ratio” of the staple-forming surface 5002 is the ratio of the non-forming portion 5008 to the forming portion, i.e., the pockets 5006. The forming ratio of the staple-forming surface 5002 is about 1:1. In other instances, the forming ratio can be less than 1:1 or more than 1:1. For example, in at least one instance, more than 50% of the staple-forming surface 5002 can be covered with staple-forming pockets 5006. In another instances, more than 60% or more than 75% of the stapling-forming surface 5002 can be covered with staple-forming pockets 5006.

Referring now to FIGS. 117-120C, staple-forming pockets 5106 in a portion of an anvil 5100 are depicted. Similar to the anvil 3800, the pockets 5106 are arranged in a herringbone arrangement along the staple-forming surface 5102 of the anvil 5100. The anvil 5100 includes a staple-forming surface 5102 and a longitudinal slot 5104. The longitudinal slot 5104 extends along the longitudinal axis LA of the anvil 5100. In certain instances, a firing element and/or a cutting element can translate through the longitudinal slot 5104 during at least a portion of a firing stroke. The staple-forming pockets 5106 are defined in the staple-forming surface 5102. The staple-forming surface 5102 also includes a non-forming portion 5108 that extends around the pockets 5106. The non-forming portion 5108 extends entirely around each pocket 5106. In other words, the non-forming portion 5108 surrounds the staple-forming pockets 5106. In other instances, at least a portion of two or more adjacent pockets 5106 can be in abutting contact such that a non-forming portion 5108 is not positioned therebetween.

The forming ratio of the staple-forming surface 5102 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 5108 of the anvil 5100 can be minimized with respect to the staple-forming pockets 5106. Additionally or alternatively, the footprint of the staple-forming pockets 5106 can be extended or enlarged to maximize the portion of the staple-forming surface 5102 that is designed to catch and form the staples.

The pockets 5106 depicted in FIG. 117 are arranged in an inner row 5114 a, an intermediate row 5114 b, and an outer row 5114 c on a first side of the longitudinal slot 5104. Inner pockets 5106 a are positioned in the inner row 5114 a, intermediate pockets 5106 b are positioned in the intermediate row 5114 b, and outer pockets 5106 c are positioned in the outer row 5114 c. Although not shown in FIG. 117 , in at least one instance, the pockets 5106 on the opposing side of the slot 5104 can form a mirror image reflection of the pockets 5106 on the first side of the longitudinal slot 5104. In other instances, the arrangement of pockets 5106 in the staple-forming surface 5102 can be asymmetrical relative to the slot 5104 and, in certain instances, the anvil 5100 may not include the longitudinal slot 5104. In various instances, the pockets 5106 can be arranged in less than or more than three rows on each side of the slot 5104.

The inner pockets 5106 a are identical, the intermediate pockets 5106 b are identical, and the outer pockets 5106 c are identical; however, the inner pockets 5106 a are different than the intermediate pockets 5106 b and the outer pockets 5106 c, and the intermediate pockets 5106 b are different than the outer pockets 5106 c. In other words, the pockets 5106 in each row 5114 a, 5114 b, and 5114 c are different. In other instances, the pockets 5106 in two or more of the rows can be the same. For example, the inner pockets 5106 a can be the same as the outer pockets 5106 c. Extended landing zones 5130 and 5132 of the pockets 5106 a, 5106 b, and 5106 c, which are described herein, can contribute to the different geometries thereof. Moreover, the shape and size of the extended landing zones 5130 and 5132 are confined by the perimeter 5116 of the adjacent, nested pockets 5106. The landing zones 5130 and 5132 define an arcuate profile. In other instances, the landing zones 5030 and 5032 can be polygonal and/or include one or more linear and/or contoured portions.

Although the pockets in each row 5114 a, 5114 b, and 5114 c are different, the pockets 5106 can be configured to form staples to the same, or substantially the same, formed shape. In other instances, the pockets 5106 can be configured to form staples to different formed shapes, such as to different heights and/or configurations. In certain instances, the pockets 5106 can vary longitudinally within each row 5114 a, 5114 b, and 5114 c. For example, in certain instances, the depth of the pockets 5106 or portions thereof can vary along the length of the anvil 5100 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

An exemplary intermediate pocket 5106 b is shown in FIGS. 117-120C. The pocket 5106 b has a first end, or proximal end, 5110 and a second end, or distal end, 5112. A pocket axis PA (FIG. 118 ) extends between the proximal end 5110 and the distal end 5112 of the pocket 5106 b. The pocket 5106 b includes a perimeter 5116, which defines the boundary of the pocket 5106 b. The perimeter 5116 includes linear portions and contoured portions. More specifically, the perimeter 5116 includes linear portions and contoured corners therebetween at which the linear portions change directions. Referring again to FIG. 117 , at least a portion of the perimeter 5116 of each pocket 5106 closely tracks or parallels at least a portion of the perimeter of one or more adjacent pockets 5106. The rounded perimeter 5116 of the pocket 5106 b can provide a smoother profile, which can be easier to coin and/or stamp in the staple-forming surface 5102 than pockets having sharp corners, for example.

The pocket 5106 b includes a proximal cup 5120, a distal cup 5122, and a neck portion 5124 extending between the proximal cup 5120 and the distal cup 5122. When a staple is driven into forming contact with the staple-forming surface 5102, the proximal cup 5120 is aligned with a proximal staple leg, and the distal cup 5122 is aligned with a distal staple leg. The cups 5120 and 5122 are configured to direct or funnel the staple legs toward the pocket axis PA and the central portion of the pocket 5106, such as the neck portion 5124, and to deform the staple legs into the formed configuration.

Referring primarily to FIG. 119 , each cup 5120, 5122 of the pocket 5106 b defines an entrance ramp 5140 and an exit ramp 5142. When forming a staple, the tip of a staple leg can enter the respective pocket 5120, 5122 along the entrance ramp 5140 and exit the respective pocket 5120, 5122 along the exit ramp 5142. At an apex 5146 between the entrance ramp 5140 and the exit ramp 5142, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 5106 b also defines a bridge 5144 in the neck portion 5124 between the proximal cup 5120 and the distal cup 5122. The bridge 5144 is offset from the non-forming portion 5108. More specifically, the bridge 5144 is positioned below or recessed relative to the non-forming portion 5108.

Referring primarily to FIGS. 120A-120C, the pocket 5106 b includes sidewalls 5150, which extend from the non-forming portion 5108. The sidewalls 5150 include linear portions and contoured portions. The sidewalls 5150 widen toward a central region 5121 (FIG. 118 ) of each cup 5120, 5122, and narrow from the central region 5121 of each cup 5120, 5122 toward the neck portion 5124. The widened central region 5121 provides an enlarged footprint for receiving the tip of a staple leg. As the cups 5120, 5122 narrow toward the neck 5124, the cups 5120, 5122 are configured to funnel and/or guide the staple legs and tips thereof toward and/or along the pocket axis PA and into a formed configuration.

FIG. 120A is taken along the plane ALL in FIG. 118 , which corresponds to the anticipated landing location of a staple leg. For example, the tip of a staple leg can be expected to land in the proximal cup 5120 at and/or near the intersection of the plane ALL and the pocket axis PA. At the plane ALL, the pocket 5106 b defines a width W_(A) and a depth D_(A). The cross-section in FIG. 120B is taken across a transition between the proximal cup 5120 and the neck 5124. FIG. 120B depicts the pocket 5106 b defining a width W_(B) and a depth D_(B). The width W_(B) is less than the width W_(A), and the depth D_(B) is greater than the depth D_(A). In other words, the pocket 5106 b narrows and deepens from the plane ALL in the proximal cup 5120 toward the neck 5124. The comparatively large width W_(A) at the plane ALL is configured to provide a wide basin or receptacle for receiving the staple leg. The cross-section in FIG. 120C is taken across the neck portion 5124. FIG. 120C depicts the pocket 5106 b defining a width W_(C) and a depth D_(C). The width W_(C) is less than the width W_(B), and the depth D_(C) is less than the depth D_(B). In other words, the pocket 5106 b continues to narrow, and becomes shallower in the neck 5124 across the bridge 5144.

The bottom surface 5158 of the pocket 5106 b is a flat surface. In other instances, the bottom surface 5158 can have a groove defined along at least a portion thereof. In still instances, the bottom surface 5158 can form a trough and/or can include hump or ridge along at least a portion thereof, such as across the bridge 5144, for example.

Referring primarily now to FIG. 118 , the pocket 5106 b includes a proximal extended landing zone 5130 and a distal extended landing zone 5132. The proximal extended landing zone 5130 is positioned in a proximal portion of the proximal cup 5120, and the distal extended landing zone 5132 is positioned in a distal portion of the distal cup 5122. More specifically, the extended landing zones 5130 and 5132 are positioned beyond the anticipated landing location of a staple. For example, the proximal extended landing zone 5130 is positioned proximal to the plane ALL and, in instances where the tip of a staple leg lands beyond the plane ALL, the proximal extended landing zone 5130 can catch the staple leg and direct it toward the pocket axis PA and/or toward the neck portion 5124.

The geometry of the extended landing zones 5130 and 5132 is constrained by the perimeter 5016 of the adjacent staple-forming pockets 5106. For example, the extended landing zones 5130 and 5132 can extend toward and/or into nearly abutting contact with one of more adjacent staple-forming pockets. The extended landing zones 5130 and 5132 and/or other portions of the pocket 5106 b can extend parallel to adjacent staple-forming pockets 5106. In other instances, the extended landing zones 5130 and 5132 can abut one or more adjacent staple-forming pockets 5106.

Referring again to FIG. 118 , the pocket 5106 b is asymmetric about the pocket axis PA. For example, the perimeter 5116 of the pocket 5106 b is asymmetric about the pocket axis PA. Moreover, the pocket 5106 b is asymmetric about a central axis CA through the neck portion 5124 and perpendicular to the pocket axis PA. For example, the perimeter 5116 of the pocket 5106 b is asymmetric about the central axis CA, and the proximal cup 5120 has a different geometry than the distal cup 5122. Although the proximal cup 5120 and the distal cup 5122 are different, the pocket 5106 b can be configured to form symmetric staples. For example, referring again to FIG. 119 , the distal depth D₂ can be less than the proximal depth D₁ to accommodate for variations in gap distance between the anvil and the staple cartridge and/or tissue flow, as described herein. Accordingly, the formed height of the proximal and distal legs of a staple can be equal. In other instances, the pocket 5106 can be configured to form asymmetric staples.

Referring again to FIG. 118 , the neck portion 5124 is narrower than the proximal and distal cups 5120 and 5122. The narrowed perimeter 5116 of the pocket 5106 b at the neck portion 5124 defines a receiving peninsula 5126 between a portion of the proximal cup 5120 and a portion of the distal cup 5122. Receiving peninsulas 5126 are positioned on each side of the pocket 5106 b. The receiving peninsulas 5126 are bounded by the perimeter 5116 of the pocket 5106 b and a tangent axis (e.g., T_(B1) or T_(B2)), which is tangential to the widest portions of the proximal and distal cups 5120 and 5122 on each side of the pocket 5106. A first tangent axis T_(B1) is positioned on a first side of the pocket 5106 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 5106 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 118 are skewed relative to the pocket axis PA. In other instances, one or both of the tangent axes T_(B1) and T_(B2) can be parallel to the pocket axis PA.

Referring again to FIG. 117 , the perimeters 5116 of the pockets 5106 are nested or interlocked along the staple-forming surface 5102. In particular, each pocket 5106 extends into the receiving peninsula 5126 of an adjacent pocket 5106. For example, the intermediate pockets 5106 b are nested between the inner pockets 5106 a and the outer pockets 5106 c. Stated differently, the intermediate pockets 5106 b extend into the receiving peninsula 5126 of an adjacent inner pocket 5106 a and into the receiving peninsula 5126 of an adjacent outer pocket 5106 c. Moreover, the inner pockets 5106 a and the outer pockets 5106 b are nested with the intermediate pockets 5106 b. More specifically, the inner pockets 5106 a extend into the receiving peninsula 5126 of an adjacent intermediate pocket 5106 b, and the outer pockets 5106 c extend into the receiving peninsula 5126 of an adjacent intermediate pocket 5106 b. In various instances, the distal extended landing zone 5132 of the intermediate pocket 5106 b is positioned in the receiving peninsula 5126 of an inner pocket 5106 a, the proximal extended landing zone 5130 of the intermediate pocket 5106 b is positioned in the receiving peninsula 5126 of an outer pocket 5106 c, the distal extended landing zone 5132 of an inner pocket 5106 a is positioned in the receiving peninsula 5126 of an intermediate pocket 5106 b, and the proximal extended landing zone 5130 of the outer pocket 5106 c is positioned in the receiving peninsula 5126 of an intermediate pocket 5106 b.

The geometry of the pockets 5106 facilitates the nesting of the pockets 5106 in the staple-forming surface 5102. For example, because the pockets 5106 include a narrowed neck portion 5124 between two enlarged cups 5120 and 5122, one of the enlarged cups 5120, 5122 of another pocket 5106 can be positioned adjacent to the narrowed neck portion 5124. For example, one of the enlarged cups 5120, 5122 can be aligned with and/or received by a portion of an adjacent pocket 5106. In such instances, the surface area of the staple-forming surface 5102 that is covered by the pockets 5106 can be optimized. For example, the surface area of the staple-forming surface 5102 that is covered by the pockets 5106 is maximized. The “forming ratio” of the staple-forming surface 5102 is the ratio of the non-forming portion 5108 to the forming portion, i.e., the pockets 5106. In at least one instance, the forming ratio can be at least 1:1, for example. In certain instances, more than 60% or more than 75% of the staple-forming surface 5102 can be covered by staple-forming pockets 5106.

Referring now to FIGS. 121-125C, staple-forming pockets 5206 in a portion of an anvil 5200 are depicted. Similar to the anvil 3800, the pockets 5206 are arranged in a herringbone arrangement along the staple-forming surface 5202 of the anvil 5200. The anvil 5200 includes a staple-forming surface 5202 and a longitudinal slot 5204. The longitudinal slot 5204 extends along the longitudinal axis LA of the anvil 5200. In certain instances, a firing element and/or a cutting element can translate through the longitudinal slot 5204 during at least a portion of a firing stroke. The staple-forming pockets 5206 are defined in the staple-forming surface 5202. The staple-forming surface 5202 also includes a non-forming portion 5208 that extends around the pockets 5206. The non-forming portion 5208 extends entirely around each pocket 5206. In other words, the non-forming portion 5208 surrounds the staple-forming pockets 5206. In other instances, at least a portion of two or more adjacent pockets 5206 can be in abutting contact such that a non-forming portion 5208 is not positioned therebetween.

The forming ratio of the staple-forming surface 5202 can be optimized. By optimizing the forming ratio, more staples can be formed and/or formed to their desired configurations. In certain instances, the surface area of the non-forming portion 5208 of the anvil 5200 can be minimized with respect to the staple-forming pockets 5206. Additionally or alternatively, the footprint of the staple-forming pockets 5206 can be extended or enlarged to maximize the portion of the staple-forming surface 5202 that is designed to catch and form the staples.

The pockets 5206 depicted in FIG. 121 are arranged in an inner row 5214 a, an intermediate row 5214 b, and an outer row 5214 c on a first side of the longitudinal slot 5204. Inner pockets 5206 a are positioned in the inner row 5214 a, intermediate pockets 5206 b are positioned in the intermediate row 5214 b, and outer pockets 5206 c are positioned in the outer row 5214 c. Although not shown in FIG. 121 , in at least one instance, the pockets 5206 on the opposing side of the slot 5204 can form a mirror image reflection of the pockets 5206 on the first side of the longitudinal slot 5204. In other instances, the arrangement of pockets 5206 in the staple-forming surface 5202 can be asymmetrical relative to the slot 5204 and, in certain instances, the anvil 5200 may not include the longitudinal slot 5204. In various instances, the pockets 5206 can be arranged in less than or more than three rows on each side of the slot 5204.

The pockets 5206 depicted in FIG. 121 are identical. Each pocket 5206 defined in the staple-forming surface 5202 has the same geometry. In other instances, the geometry of the pockets 5206 can vary row-to-row and/or longitudinally along the length of the anvil 5200. For example, in certain instances, the depth of the pockets 5206 can vary along the length of the anvil 5200 to accommodate for variations in gap distance between the anvil and the staple cartridge along the length of an end effector and/or tissue flow, as described herein.

The pockets 5206 can be configured to form staples to the same, or substantially the same, formed shape. As described herein, the pockets 5206 can be configured to form each staple to the same asymmetrical shape. In other instances, the pockets 5206 can be configured to form staples to different formed shapes, such as to different heights and/or configurations.

An exemplary intermediate pocket 5206 b is shown in FIGS. 122-125C. The pocket 5206 b has a first end, or proximal end, 5210 and a second end, or distal end, 5212. A pocket axis PA (FIG. 121 ) extends between the proximal end 5210 and the distal end 5212 of the pocket 5206 b. The pocket 5206 b includes a perimeter 5216, which defines the boundary of the pocket 5206 b. The perimeter 5216 includes linear portions and contoured portions.

The pocket 5206 b includes a proximal cup 5220, a distal cup 5222, and a neck 5224 extending between the proximal cup 5220 and the distal cup 5222. When a staple is driven into forming contact with the staple-forming surface 5202, the proximal cup 5220 is aligned with a proximal staple leg, and the distal cup 5222 is aligned with a distal staple leg. The cups 5220 and 5222 are configured to direct or funnel the staple legs toward the pocket axis PA and the central portion of the pocket 5206, such as the neck portion 5224, and to deform the staple legs into the formed configuration. In other instances, the cup 5222 can be proximal to the cup 5220.

Referring primarily to FIG. 119 , each cup 5220 and 5222 of the pocket 5206 b defines an entrance ramp 5240 a and 5240 b, respectively, and an exit ramp 5242 a and 5242 b, respectively. When forming a staple, the tip of a staple leg can enter the respective pocket 5220, 5222 along the entrance ramp 5240 a, 5240 b and exit the respective pocket 5220, 5222 along the exit ramp 5242 a, 5242 b. At an apex 5246 a, 5246 b, respectively, between the entrance ramp 5240 a, 5240 b and the exit ramp 5242 a, 5242 b, the tips of the staple legs are deformed toward the staple base to assume the formed configuration, such as a B-form or modified B-form, for example. The pocket 5206 b also defines a bridge 5244 between the proximal cup 5220 and the distal cup 5222. The bridge 5244 is offset from the non-forming portion 5208. More specifically, the bridge 5244 is positioned below or recessed relative to the non-forming portion 5208.

Referring again to FIG. 122 , the pocket 5206 b is symmetric about the pocket axis PA. For example, the perimeter 5216 of the pocket 5206 b is symmetric about the pocket axis PA. Moreover, the pocket 5206 b is asymmetric about a central axis CA through the neck portion 5224 and perpendicular to the pocket axis PA. For example, the perimeter 5216 of the pocket 5206 b is asymmetric about the central axis CA, and the proximal cup 5220 has a different geometry than the distal cup 5222. The asymmetry of the cups 5220 and 5222 is configured to form asymmetric staples. For example, referring again to FIG. 123 , the distal depth D₂ is less than the proximal depth D₁, which is configured to form a staple having a greater formed height at the proximal leg than at the distal leg. The distal depth D₂ can be about 0.002 inches less than the proximal depth D₁. In other instances, the difference between the distal depth D₂ and the proximal depth D₁ can be greater than and/or less than 0.002 inches. In certain instances, the difference can be between one percent and ten percent of the staple diameter. For example, the difference can be about two percent of the staple diameter. In other instances, the formed height of the staple can be greater at the distal leg than the proximal leg. The length of each cup 5220, 5222 is also different. For example, the distal length D₂ is greater than the proximal length D₁ in FIG. 123 . Additionally, the incline of the entrance ramps 5240 a and 5240 b in the pocket 5206 b are different, and the incline of the exit ramps 5242 a and 5242 b in the pocket 5206 b are also different.

In various instances, the reduced depth in a portion of the pocket 5206 b can improve the stiffness of the anvil. For example, because the distal depth D₂ is less than the proximal depth D₁, the anvil 5200 is comprised of more material, which can increase the stiffness thereof. Moreover, because the increased material is in a distal portion of the anvil 5200, such portion can have an increased stiffness, which can limit bowing or deformation of the anvil toward the distal end.

The difference in geometry of the proximal and distal cups 5220 and 5222, respectively, can accommodate for tissue movement or flow. More specifically, when tissue is clamped against the anvil 5200, fluid in the clamped tissue can flow or move toward adjacent, unclamped tissue. The tissue can flow laterally toward the longitudinal sides of the anvil 5200, distally toward the distal end of the anvil 5200, and/or proximally toward the proximal end of the anvil 5200. In certain instances, tissue can flow relative to the anvil 5200 when the cutting edge is advanced distally through the tissue. In such instances, tissue may flow laterally, distally, and/or proximally, but it primarily flows distally due to the distal movement of the cutting edge. In instances where the cutting edge moves proximally to incise tissue, the movement or flow of the tissue would be generally proximal during the cutting stroke. The different geometries of the proximal and distal cups 5220 and 5222, respectively, can accommodate for the flow of the tissue, which can shift or skew the staple legs embedded therein.

Referring primarily to FIGS. 124A-124C, the pocket 5206 b includes sidewalls 5250, which extend from the non-forming portion 5208. The cups 5220, 5222 are configured to funnel and/or guide the staple legs and tips thereof toward and/or along the pocket axis PA and into a formed configuration. Owing to the different geometries of the proximal and distal cups 5220 and 5222, the path of the proximal staple leg can be different than the path of the distal staple leg when driven into forming contact with the pocket 5206 b. In certain instances, the asymmetrical staple pockets 5206 b can form asymmetrical staples from symmetrical unformed staples. Additionally or alternatively, asymmetrical unformed staples can be formed into asymmetrical formed staples by the staple pockets 5206 b.

FIG. 124A is taken along the plane ALL₁ in FIG. 122 , which corresponds to the anticipated landing location of a proximal staple leg. For example, the tip of a proximal staple leg can be expected to land in the proximal cup 5220 at and/or near the intersection of the plane ALL₁ and the pocket axis PA. At the plane ALL₁, the proximal cup 5220 defines a width W1 _(A) and a depth D1 _(A). The cross-section in FIG. 124B is taken across a transition between the proximal cup 5220 and the neck 5224. FIG. 124B depicts the proximal cup 5220 defining a width W1 _(B) and a depth D1 _(B). The width W1 _(B) is greater than the width W1 _(A), and the depth D1 _(B) is greater than the depth D1 _(A). In other words, the proximal cup 5220 widens and deepens from the plane ALL₁ in the proximal cup 5220 toward the neck 5224. The cross-section in FIG. 124C is taken across a proximal end of the neck portion 5224. FIG. 124C depicts the pocket 5206 b defining a width W1 _(C) and a depth D1 _(C). The width W1 _(C) is less than the width W1 _(B), and the depth D1 _(C) is less than the depth D1 _(B). In other words, the pocket 5206 b continues to narrow, and becomes shallower in the neck 5224 across the bridge 5244.

FIG. 125A is taken along the plane ALL₂ in FIG. 122 , which corresponds to the anticipated landing location of a distal staple leg. For example, the tip of a distal staple leg can be expected to land in the distal cup 5222 at and/or near the intersection of the plane ALL₂ and the pocket axis PA. At the plane ALL₂, the distal cup 5222 defines a width W2 _(A) and a depth D2 _(A). The width W2 _(A) is different than the width W1 _(A), and the depth D2 _(A) is different than the depth D1 _(A). The cross-section in FIG. 125B is taken across a transition between the distal cup 5222 and the neck 5224. FIG. 125B depicts the distal cup 5222 defining a width W2 _(B) and a depth D2 _(B). The width W2 _(B) is different than the width W1 _(B), and the depth D2 _(B) is different than the depth D1 _(B). The width W2 _(B) is less than the width W2 _(A), and the depth D2 _(B) is greater than the depth D2 _(A). In other words, the distal cup 5222 narrows and deepens from the plane ALL₂ in the distal cup 5222 toward the neck 5224. The cross-section in FIG. 125C is taken across a distal end of the neck portion 5224. FIG. 125C depicts the pocket 5206 b defining a width W2 _(C) and a depth D2 _(C). The width W2 _(C) is different than the width W1 _(C), and the depth D2 _(C) is different than the depth D1 _(C). The width W2 _(C) is less than the width W2 _(B), and the depth D2 _(C) is less than the depth D2 _(B). In other words, the pocket 5206 b continues to narrow, and becomes shallower in the neck 5224 across the bridge 5244.

The bottom surface 5258 of the pocket 5206 b is a flat surface. In other instances, the bottom surface 5258 can have a groove defined along at least a portion thereof. In still other instances, the bottom surface 5258 can form a trough and/or can include a hump or ridge along at least a portion thereof, such as across the bridge 5244, for example.

Referring primarily now to FIG. 122 , the pocket 5206 b includes a proximal extended landing zone 5230 and a distal extended landing zone 5232. The proximal extended landing zone 5230 is positioned in a proximal portion of the proximal cup 5220, and the distal extended landing zone 5232 is positioned in a distal portion of the distal cup 5222. More specifically, the extended landing zones 5230 and 5232 are positioned beyond the anticipated landing location of a staple. For example, the proximal extended landing zone 5230 is positioned proximal to the plane ALL₁ and, in instances where the tip of a staple leg lands beyond the plane ALL₁, the proximal extended landing zones 5230 can catch the staple leg and direct it toward the pocket axis PA and/or toward the neck portion 5224. The distal extended landing zone 5232 is positioned distal to the plane ALL₂ and, in instances where the tip of a staple leg lands beyond the plane ALL₂, the distal extended landing zones 5232 can catch the staple leg and direct it toward the pocket axis PA and/or toward the neck portion 5224. In certain instances, the geometry of the extended landing zones 5230, 5232 can be constrained or limited by the geometry of the adjacent, nested staple-forming pockets 5206.

Referring again to FIG. 122 , the neck portion 5224 is narrower than the proximal and distal cups 5220 and 5222. The narrowed perimeter 5216 of the pocket 5206 b at the neck portion 5224 defines a receiving peninsula 5226 between a portion of the proximal cup 5220 and a portion of the distal cup 5222. Receiving peninsulas 5226 are positioned on each side of the pocket 5206 b. The receiving peninsulas 5226 are bounded by the perimeter 5216 of the pocket 5206 b and a tangent axis (e.g., T_(B1) and T_(B2)), which is tangential to the widest portions of the proximal and distal cups 5220 and 5222 on each side of the pocket 5206. A first tangent axis T_(B1) is positioned on a first side of the pocket 5206 b and a second tangent axis T_(B2) is positioned on the opposite side of the pocket 5206 b. The first and second tangent axes T_(B1) and T_(B2) depicted in FIG. 122 are skewed relative to the pocket axis PA. In other instances, one or both of the tangent axes T_(B1) and T_(B2) can be parallel to the pocket axis PA.

In various instances, the geometry of the pockets 5206 can facilitate the nesting and/or the close arrangement of the pockets 5206 in the staple-forming surface 5202. For example, the surface area of the staple-forming surface 5202 that is covered by the pockets 5206 can be optimized. The “forming ratio” of the staple-forming surface 5202 is the ratio of the non-forming portion 5208 to the forming portion, i.e., the pockets 5206. In at least one instance, the forming ratio can be at least 1:1, for example.

As described herein, the arrangement of staple cavities and staples in a staple cartridge for an end effector can correspond to or match the arrangement of staple-forming pockets in an anvil of the end effector. More specifically, the angular orientation and spacing of each staple cavity can match the angular orientation and spacing of a respective staple-forming pocket. For example, when the staple cavities are arranged in a herringbone pattern, the staple-forming pockets can be arranged in a corresponding herringbone pattern.

In certain instances, an end effector can include a staple cartridge having an arrangement of staple cavities and an anvil having a non-corresponding arrangement of staple-forming pockets. For example, the staple cavities can be obliquely oriented relative to a longitudinal axis and the staple-forming pockets can be oriented parallel to the longitudinal axis. In certain instances, an end effector can be configured to receive different staple cartridges having different arrangements of staple cavities, for example, and the anvil of the end effector may not be compatible with all of the different staple cartridges and permutations of staple cavities therein. In such instances, the anvil can be retrofit or adapted with an attachment, such as an anvil plate, having a suitable arrangement of staple-forming pockets.

A surgical end effector 5500 is depicted in FIGS. 126-128 . Similar to the end effector 1100 (FIGS. 1-4 ), the end effector 5500 includes the elongate channel 1102, which is configured to operably support a staple cartridge 5510 therein. The staple cartridge 5510 is similar in many aspects to the staple cartridge 1110. For example, the staple cartridge includes a staple cartridge body 5511 having a deck 5515. A longitudinal slot 5514 extends through the deck 5515 from a proximal end portion 5512 of the body 5511 toward a distal end portion 5513 of the body 5511. Angularly-oriented staple cavities 5516 are defined in the cartridge body 5511 and each staple cavity 5516 defines an opening in the deck 5515. The opening of each staple cavity 5516 is oriented at an oblique angle relative to the longitudinal slot 5514. The staple cavities 5516 are arranged in a herringbone pattern. Staples are removably positioned in the staple cavities.

The end effector 5500 also includes an anvil 5530 that is pivotally supported relative to the elongate channel 1102. The anvil 5530 is similar in many aspects to the anvil 1130. For example, the anvil 5530 includes a staple-forming surface 5502 and a longitudinal slot 5504. In certain instances, a firing element and/or a cutting element, such as the sled assembly 1120 and/or the firing member 1760 (FIG. 4 ), for example, can translate through the longitudinal slot 5504 during at least a portion of a firing stroke. Tissue stops 5531 extend downward toward the staple cartridge 5510 to control the positioning of tissue between the proximal end portion 5512 of the cartridge body 5511 and the anvil 5530. Staple-forming pockets 5506 are defined in the staple-forming surface 5502, which also includes a non-forming portion 5508 that extends around the pockets 5506. The staple-forming pockets 5506 are oriented parallel to the longitudinal slot 5504. In other words, the arrangement of staple-forming pockets 5506 does not match or correspond to the arrangement of staple cavities 5516. If staples were fired from the staple cartridge 5510 into forming contact with the anvil 5530, the majority of such staples would likely be unformed and/or malformed.

The end effector 5500 includes an adaptor assembly 5540, which is configured to adapt the anvil 5530 to a suitable arrangement of staple-forming pockets. The staple cartridge 5510 is part of the adaptor assembly 5540. The adaptor assembly 5540 also includes an anvil plate 5550 and connecting material 5570. A proximal portion of the anvil plate 5550 forms a spring 5551 at which the anvil plate 5550 is attached to the staple cartridge 5510. As such, the anvil plate 5550 is configured to pivot downward toward the staple cartridge 5510 at the proximal spring 5551 when a closing motion is applied to the anvil plate 5550, such as by the anvil 5530, for example. The spring 5551 can bias the anvil plate 5550 toward the configuration shown in FIG. 126 , which can facilitate the releasable attachment of the adaptor assembly 5540 to the anvil 5530.

The arrangement of staple-forming pockets in the anvil plate 5550 corresponds to the arrangement of staple cavities 5516 in the staple cartridge. The anvil plate 5550 includes a staple-forming surface 5502 and a longitudinal slot 5554, which is aligned with the longitudinal slot 5504 in the anvil 5530 and the longitudinal slot 5514 in the staple cartridge 5510 when the adaptor assembly 5540 is installed in the end effector 5500. Staple-forming pockets 5556 are defined in the staple-forming surface 5502 and a non-forming portion 5558 (FIG. 126 ) extends around the staple-forming pockets 5556. In the illustrated embodiment, the staple-forming pockets 5556 are oriented at oblique angles relative to the longitudinal slot 5554. More specifically, the staple-forming pockets 5556 are arranged in a herringbone pattern, which corresponds to the herringbone pattern of the staple cavities 5516. The anvil plate 5550 can be a sheet of metal in which the arrangement of staple-forming pockets has been stamped.

The arrangement of staple-forming pockets 5556 in the anvil plate 5550 corresponds to the arrangement of staple cavities 5516 in the staple cartridge. In other words, each staple-forming pocket 5556 in the anvil plate 5550 corresponds to the angle and position of a staple cavity 5516. The reader will appreciate that a staple cartridge can include a variety of different arrangements of staple cavities, and various exemplary arrangements of staple cavities are described herein. For example, a staple cartridge can include a longitudinally-repetitive pattern of obliquely-oriented staple cavities and/or one or more parallel and/or angularly-offset staple cavities. Additionally or alternatively, a staple cartridge can include multiple distinct patterns of staple cavities. In still other instances, the arrangement of staple cavities can vary laterally and/or longitudinally along the cartridge body. Whatever the arrangement of staple cavities in a staple cartridge, a corresponding arrangement of staple-forming pockets can be provided by the complementary anvil plate 5550 of the adaptor assembly 5540.

The anvil plate 5500 is connectable to the staple cartridge 5510, and the connecting material 5570 is attached to the anvil plate 5500. In use, when the staple cartridge 5510 is inserted into the elongate channel 1102, the anvil plate 5500 and the connecting material 5570 of the adaptor assembly 5540 are also disposed between the elongate channel 1102 and the anvil 5530. In certain instances, the anvil 5530 can be pivoted downward toward the elongate channel 1102 to secure or otherwise attach the anvil plate 5550 to the staple-forming surface 5502 of the anvil 5530 with the connecting material 5570. Additionally or alternatively, the spring member 5551 can bias the anvil plate 5550 and the connecting material 5570 thereon into and/or toward attachment with the anvil 5530. When the adaptor assembly 5540 is installed in the end effector 5500, the anvil 5530 has effectively been retrofit or adapted for use with the staple cartridge 5510.

The staple cartridge 5510 and the anvil plate 5550 may include alignment features for aligning the staple cavities 5516 in the staple cartridge 5510 with the corresponding staple-forming pockets 5556 in the anvil plate 5500. For example, the staple cartridge 5510 includes alignment apertures 5520 (FIG. 126 ), and the anvil plate 5550 includes alignment posts or pins 5562. The alignment pins 5562 are received by the alignment apertures 5520 to position the anvil plate 5550 relative to the staple cartridge 5510. For example, the alignment pins 5562 can be press fit into the alignment apertures 5520. The connection between the alignment apertures 5520 and the alignment pins 5562 is configured to longitudinally align the staple cartridge 5510 and the anvil plate 5550, for example.

In certain instances, the manufacturer and/or distributor can provide the assembly 5540 pre-assembled. For example, the anvil plate 5550 can be press fit into engagement with the staple cartridge 5510 before a surgeon or assistant thereto obtains the assembly 5540 for a surgical procedure. In other instances, the surgeon and/or assistant thereto can assemble the assembly 5540.

The anvil plate 5550 also includes alignment features for aligning the anvil plate 5550 with the anvil 5530. For example, the anvil plate 5550 includes distal alignment flanges 5564. The distal alignment flanges 5564 are received by the longitudinal slot 5504 in the anvil 5530 to position the anvil plate 5550 relative to the anvil 5530. For example, the distal alignment flanges 5564 can be press fit into the longitudinal slot 5504. The connection between the alignment flanges 5564 and the longitudinal slot 5504 is configured to laterally align the anvil plate 5550 and the anvil 5530, for example.

The connecting material 5570 is a flexible material. For example, the connecting material 5570 can comprise an elastomer and/or low density polyethylene. In various instances, the connecting material 5570 can be an overmold on the anvil plate 5550. When adhered or otherwise secured to the anvil 5530, the connecting material 5570 is configured to assume a deformed configuration that matches the profile of the staple-forming surface 5502. For example, the unformed configuration of the connecting material 5570 is depicted in FIG. 126 and the formed configuration of the connecting material 5570 is depicted in FIG. 127 . Referring primarily to FIG. 127 , the connecting material 5570 flows into and fills the staple-forming pockets 5506. In other words, the staple-forming pockets 5506 imprint in the connecting material 5570. In such instances, the connecting material 5570 can fortify the anvil plate 5550 during a forming process. For example, the connecting material 5570 between the anvil plate 5550 and the anvil 5530 can provide a backing for the anvil plate 5550 to prevent and/or limit deformation of the anvil plate 5550 relative to the anvil 5530 when the anvil plate 5550 is impacted and subjected to other forces during use.

The connecting material 5570 includes a channel 5572. The channel 5572 extends along a portion of the length thereof. Although not shown in FIG. 126 , a similar channel 5572 can be defined in the connecting material 5570 along the opposite side of the adaptor assembly 5540. A lip 5566 of the anvil plate 5550 is positioned in the channel 5572. The lip 5566 is substantially U-shaped. In other instances, the lip 5566 can be L-shaped, linear, and/or contoured, for example. The anvil plate 5500 also includes an inner ridge 5568, which is aligned with a longitudinal slot 5574 (FIG. 126 ) in the connecting material 5570 and the longitudinal slot 5504 in the anvil 5530. The ridge 5568 is configured to facilitate the alignment of the adaptor assembly 5540 along the length of the end effector 5500. In various instances, the connecting material 5570 can be molded over the anvil plate 5550. For example, the connecting material 5570 can be molded around the lip 5566 and/or the ridge 5568.

A portion of the end effector 5500 is also depicted in FIG. 128 . An adaptor assembly 5640 is installed in the end effector 5500 in FIG. 128 . The adaptor assembly 5640 is similar in many aspects to the adaptor assembly 5540. For example, the adaptor assembly 5640 includes an anvil plate 5650 having a staple-forming surface 5652 and a longitudinal slot 5654, which is aligned with the longitudinal slot 5504 in the anvil 5530. Staple-forming pockets 5656 are defined in the staple-forming surface 5652 and a non-forming portion 5658 extends around the staple-forming pockets 5656. The staple-forming pockets 5656 are oriented at oblique angles relative to the longitudinal slot 5654. More specifically, the staple-forming pockets 5656 are arranged in a herringbone pattern, which corresponds to the herringbone pattern of the staple cavities 5516 (FIG. 126 ). The anvil plate 5650 can be a sheet of metal in which the arrangement of staple-forming pockets has been stamped.

The adaptor assembly 5640 does not include a deformable material, such as the deformable material 5570. Rather, the anvil plate 5650 is configured to directly engage the anvil 5530. The anvil plate 5650 includes a lip 5666, which is positioned against the staple-forming surface 5502. The lip 5666 is substantially U-shaped. In other instances, the lip 5666 can be L-shaped, linear, and/or contoured, for example. The anvil plate 5600 also includes an inner ridge 5668, which is aligned with the longitudinal slot 5504 in the anvil 5530. The ridge 5668 is configured to facilitate the alignment of the adaptor assembly 5640 along the length of the end effector 5600.

In other instances, the anvil plate 5650 can be embedded in the staple-forming surface 5502 of the anvil 5530. For example, staple-forming pockets 5656 of the anvil plate 5650 can at least partially nest within the staple-forming pockets 5506 in the anvil 5530. Although the arrangement, quantity, and/or geometry of the staple-forming pockets 5656 are different than the arrangement, quantity, and/or geometry of the staple-forming pockets 5506, portions of the staple-forming pockets 5656 can be positioned within portions of the staple-forming pockets 5506.

Many of the surgical instrument systems described herein are motivated by an electric motor; however, the surgical instrument systems described herein can be motivated in any suitable manner. In various instances, the surgical instrument systems described herein can be motivated by a manually-operated trigger, for example. In certain instances, the motors disclosed herein may comprise a portion or portions of a robotically controlled system. Moreover, any of the end effectors and/or tool assemblies disclosed herein can be utilized with a robotic surgical instrument system. U.S. patent application Ser. No. 13/118,241, entitled SURGICAL STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT ARRANGEMENTS, now U.S. Patent Application Publication No. 2012/0298719, for example, discloses several examples of a robotic surgical instrument system in greater detail.

The surgical instrument systems described herein have been described in connection with the deployment and deformation of staples; however, the embodiments described herein are not so limited. Various embodiments are envisioned which deploy fasteners other than staples, such as clamps or tacks, for example. Moreover, various embodiments are envisioned which utilize any suitable means for sealing tissue. For instance, an end effector in accordance with various embodiments can comprise electrodes configured to heat and seal the tissue. Also, for instance, an end effector in accordance with certain embodiments can apply vibrational energy to seal the tissue.

The entire disclosures of:

-   -   U.S. Pat. No. 5,403,312, entitled ELECTROSURGICAL HEMOSTATIC         DEVICE, which issued on Apr. 4, 1995;     -   U.S. Pat. No. 7,000,818, entitled SURGICAL STAPLING INSTRUMENT         HAVING SEPARATE DISTINCT CLOSING AND FIRING SYSTEMS, which         issued on Feb. 21, 2006;     -   U.S. Pat. No. 7,422,139, entitled MOTOR-DRIVEN SURGICAL CUTTING         AND FASTENING INSTRUMENT WITH TACTILE POSITION FEEDBACK, which         issued on Sep. 9, 2008;     -   U.S. Pat. No. 7,464,849, entitled ELECTRO-MECHANICAL SURGICAL         INSTRUMENT WITH CLOSURE SYSTEM AND ANVIL ALIGNMENT COMPONENTS,         which issued on Dec. 16, 2008;     -   U.S. Pat. No. 7,670,334, entitled SURGICAL INSTRUMENT HAVING AN         ARTICULATING END EFFECTOR, which issued on Mar. 2, 2010;     -   U.S. Pat. No. 7,753,245, entitled SURGICAL STAPLING INSTRUMENTS,         which issued on Jul. 13, 2010;     -   U.S. Pat. No. 8,393,514, entitled SELECTIVELY ORIENTABLE         IMPLANTABLE FASTENER CARTRIDGE, which issued on Mar. 12, 2013;     -   U.S. patent application Ser. No. 11/343,803, entitled SURGICAL         INSTRUMENT HAVING RECORDING CAPABILITIES; now U.S. Pat. No.         7,845,537;     -   U.S. patent application Ser. No. 12/031,573, entitled SURGICAL         CUTTING AND FASTENING INSTRUMENT HAVING RF ELECTRODES, filed         Feb. 14, 2008;     -   U.S. patent application Ser. No. 12/031,873, entitled END         EFFECTORS FOR A SURGICAL CUTTING AND STAPLING INSTRUMENT, filed         Feb. 15, 2008, now U.S. Pat. No. 7,980,443;     -   U.S. patent application Ser. No. 12/235,782, entitled         MOTOR-DRIVEN SURGICAL CUTTING INSTRUMENT, now U.S. Pat. No.         8,210,411;     -   U.S. patent application Ser. No. 12/249,117, entitled POWERED         SURGICAL CUTTING AND STAPLING APPARATUS WITH MANUALLY         RETRACTABLE FIRING SYSTEM, now U.S. Pat. No. 8,608,045;     -   U.S. patent application Ser. No. 12/647,100, entitled         MOTOR-DRIVEN SURGICAL CUTTING INSTRUMENT WITH ELECTRIC ACTUATOR         DIRECTIONAL CONTROL ASSEMBLY, filed Dec. 24, 2009; now U.S. Pat.         No. 8,220,688;     -   U.S. patent application Ser. No. 12/893,461, entitled STAPLE         CARTRIDGE, filed Sep. 29, 2012, now U.S. Pat. No. 8,733,613;     -   U.S. patent application Ser. No. 13/036,647, entitled SURGICAL         STAPLING INSTRUMENT, filed Feb. 28, 2011, now U.S. Pat. No.         8,561,870;     -   U.S. patent application Ser. No. 13/118,241, entitled SURGICAL         STAPLING INSTRUMENTS WITH ROTATABLE STAPLE DEPLOYMENT         ARRANGEMENTS, now U.S. Pat. No. 9,072,535;     -   U.S. patent application Ser. No. 13/524,049, entitled         ARTICULATABLE SURGICAL INSTRUMENT COMPRISING A FIRING DRIVE,         filed on Jun. 15, 2012; now U.S. Pat. No. 9,101,358;     -   U.S. patent application Ser. No. 13/800,025, entitled STAPLE         CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, filed on Mar. 13,         2013, now U.S. Patent Application Publication No. 2014/0263551;

U.S. patent application Ser. No. 13/800,067, entitled STAPLE CARTRIDGE TISSUE THICKNESS SENSOR SYSTEM, filed on Mar. 13, 2013, now U.S. Patent Application Publication No. 2014/0263552;

-   -   U.S. Patent Application Publication No. 2007/0175955, entitled         SURGICAL CUTTING AND FASTENING INSTRUMENT WITH CLOSURE TRIGGER         LOCKING MECHANISM, filed Jan. 31, 2006; and     -   U.S. Patent Application Publication No. 2010/0264194, entitled         SURGICAL STAPLING INSTRUMENT WITH AN ARTICULATABLE END EFFECTOR,         filed Apr. 22, 2010, now U.S. Pat. No. 8,308,040, are hereby         incorporated by reference herein.

Although various devices have been described herein in connection with certain embodiments, modifications and variations to those embodiments may be implemented. Particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, the particular features, structures or characteristics illustrated or described in connection with one embodiment may be combined in whole or in part, with the features, structures, or characteristics of one or more other embodiments without limitation. Also, where materials are disclosed for certain components, other materials may be used. Furthermore, according to various embodiments, a single component may be replaced by multiple components, and multiple components may be replaced by a single component, to perform a given function or functions. The foregoing description and following claims are intended to cover all such modification and variations.

The devices disclosed herein can be designed to be disposed of after a single use, or they can be designed to be used multiple times. In either case, however, a device can be reconditioned for reuse after at least one use. Reconditioning can include any combination of the steps including, but not limited to, the disassembly of the device, followed by cleaning or replacement of particular pieces of the device, and subsequent reassembly of the device. In particular, a reconditioning facility and/or surgical team can disassemble a device and, after cleaning and/or replacing particular parts of the device, the device can be reassembled for subsequent use. Those skilled in the art will appreciate that reconditioning of a device can utilize a variety of techniques for disassembly, cleaning/replacement, and reassembly. Use of such techniques, and the resulting reconditioned device, are all within the scope of the present application.

The devices disclosed herein may be processed before surgery. First, a new or used instrument may be obtained and, when necessary, cleaned. The instrument may then be sterilized. In one sterilization technique, the instrument is placed in a closed and sealed container, such as a plastic or TYVEK bag. The container and instrument may then be placed in a field of radiation that can penetrate the container, such as gamma radiation, x-rays, and/or high-energy electrons. The radiation may kill bacteria on the instrument and in the container. The sterilized instrument may then be stored in the sterile container. The sealed container may keep the instrument sterile until it is opened in a medical facility. A device may also be sterilized using any other technique known in the art, including but not limited to beta radiation, gamma radiation, ethylene oxide, plasma peroxide, and/or steam.

While this invention has been described as having exemplary designs, the present invention may be further modified within the spirit and scope of the disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles.

Any patent, publication, or other disclosure material, in whole or in part, that is said to be incorporated by reference herein is incorporated herein only to the extent that the incorporated materials do not conflict with existing definitions, statements, or other disclosure material set forth in this disclosure. As such, and to the extent necessary, the disclosure as explicitly set forth herein supersedes any conflicting material incorporated herein by reference. Any material, or portion thereof, that is said to be incorporated by reference herein, but which conflicts with existing definitions, statements, or other disclosure material set forth herein will only be incorporated to the extent that no conflict arises between that incorporated material and the existing disclosure material. 

What is claimed is:
 1. A method, comprising: obtaining a staple cartridge comprising cartridge body comprising a plurality of surgical staples stored therein, wherein the cartridge body further comprises an active tissue stop arrangement movably coupled thereto, wherein the active tissue stop arrangement comprises; a pair of movable tissue stops, wherein one movable tissue stop is movably coupled to one side of the cartridge body and another movable tissue stop is movably coupled to another side of the cartridge body, wherein each movable tissue stop comprises: a lower tissue stop portion defining a lower cavity therein; an upper tissue stop portion movably supported in each lower cavity, wherein each lower tissue stop portion and corresponding upper tissue stop portion are pivotally supported on a corresponding side of the staple cartridge for pivotal travel relative thereto about a common pivot axis; and a biaser for biasing each upper tissue stop out of the corresponding lower cavity, and wherein said method further comprises installing the staple cartridge in an end effector, wherein the end effector comprises an anvil comprising a fixed tissue stop arrangement such that when the staple cartridge is installed in the end effector, the active tissue stop arrangement and the fixed tissue stop arrangement prevents tissue from extending proximally beyond a proximal-most surgical staple stored in the cartridge body.
 2. The method of claim 1, wherein the anvil is movably supported relative to an elongate channel and is movable relative thereto between an open and closed position, and wherein said installing comprises removably seating the staple cartridge in the elongate channel.
 3. The method of claim 1, further comprising retaining the movable tissue stops in a collapsed orientation during said installing of the staple cartridge in the end effector.
 4. The method of claim 3, further comprising permitting the movable tissue stops to expand to an expanded orientation after the staple cartridge has been installed in the end effector and the anvil is moved to an open position.
 5. The method of claim 4, wherein the staple cartridge further comprises a removable staple cover attached to the cartridge body, wherein the removable staple cover retains the surgical staples in the cartridge body and further retains the movable tissue stops in the collapsed orientation, and wherein said permitting the movable tissue stops to expand to the expanded orientation comprises removing the removable staple cover from the cartridge body.
 6. The method of claim 4, wherein each of the movable tissue stops is biased into the expanded position.
 7. The method of claim 6, wherein the staple cartridge further comprises means for preventing each of the movable tissue stops from expanding beyond a predetermined fully expanded orientation.
 8. The method of claim 4, wherein when the movable tissue stops are in a fully expanded position and the anvil is in a fully open position, each of the movable tissue stops contact a corresponding portion of the anvil.
 9. The method of claim 1, wherein the staple cartridge comprises a plurality of staple cavities arranged in a herringbone pattern.
 10. A method, comprising: obtaining a staple cartridge comprising cartridge body that defines a cartridge deck surface, wherein the cartridge body comprises a plurality of surgical staples stored therein, wherein the cartridge body further comprises a pair of upstanding cartridge tissue stops that extend upward from a proximal end of the cartridge deck surface; and installing the staple cartridge in an end effector, wherein the end effector comprises an anvil comprising a pair of anvil tissue stops protruding downward from a proximal end of the anvil such that when the staple cartridge is installed in the end effector, the upstanding cartridge tissue stops cooperate with the anvil tissue stops to prevent tissue from extending proximally beyond a proximal-most surgical staple stored in the cartridge body, and wherein when the anvil is in a fully closed position, an upper end of each of the cartridge tissue stops is received in a corresponding tissue stop cavity formed in the anvil.
 11. The method of claim 10, wherein the anvil further comprises a pair of distal tissue stops located distal to the anvil tissue stops and the cartridge tissue stops.
 12. The method of claim 11, wherein when the anvil is in the fully closed position, the distal tissue stops do not extend below the cartridge deck surface.
 13. The method of claim 10, wherein the staple cartridge comprises a plurality of staple cavities arranged in a herringbone pattern.
 14. A method of operating a surgical stapler, wherein the surgical stapler comprises an elongate channel and an anvil movably supported relative to the elongate channel, wherein the anvil comprises a pair of fixed tissue stops protruding therefrom, and wherein said method comprises: installing a staple cartridge in the elongate channel when the anvil is in an open position, wherein the staple cartridge comprises a cartridge body comprising a movable tissue stop corresponding to each fixed tissue stop on the anvil, wherein each said movable tissue stop comprises: a first movable tissue stop portion movably coupled to the cartridge body, wherein the first movable tissue stop portion is configured to be received within a corresponding cavity in the cartridge body; and a second movable tissue stop portion corresponding to each first movable tissue stop portion and being movable relative thereto between a collapsed orientation in which the second movable tissue stop is received within the corresponding first tissue stop portion and an expanded orientation in which the second movable tissue stop portion extends out of the corresponding first tissue stop portion, and wherein said method further comprises: positioning a target tissue between the anvil and the staple cartridge such that the fixed tissue stops and each movable tissue stop prevents the target tissue from extending proximally beyond a proximal-most staple in the staple cartridge; and moving the anvil to a closed position.
 15. A method for operating a surgical stapler, comprising: installing a surgical staple cartridge into a channel of the surgical stapler when an anvil of the surgical stapler is in an open position; abutting a target tissue against fixed tissue stops protruding from the anvil and movable tissue stops protruding out of the surgical staple cartridge, wherein each movable tissue stop comprises a first portion and a second portion, wherein each first portion and each second portion is movable relative to each other between an expanded orientation and a collapsed orientation; moving the anvil to a closed position to clamp the target tissue between the anvil and the surgical staple cartridge such that movable tissue stops are moved to the collapsed orientation; and actuating the surgical stapler to drive surgical staples stored in the surgical staple cartridge through the target tissue and into forming contact with the anvil.
 16. The method of claim 15, further comprising: returning the anvil to the open position; and returning the movable tissue stops to the expanded orientation.
 17. The method of claim 16, wherein each movable tissue stop comprises a biaser configured to bias the second portion into the expanded orientation. 